problems

okay i been stuck on these problems for a week now.
1. being googling around and stil cant figure out to write collision for my pong any help would be nice.
2. why doesn't my enum_state work properly and why cant i make my main menu appear first in game not overlap over the top of my game.

here is the code i have
//stuff to complete is where my main dilimer is!


//
//#include "stdafx.h"
#include <Windows.h>
#include "GL_Functions.h"
#include "pctimer.h"
#include <string>
#include <cmath>
#include <stdio.h>
#include <crtdbg.h>



    //{ make this a function later =D
    enum STATE
    {
      MAINMENU,  // will take user to main menu at start of game or during
      SINGLEPLAYER,  // one player mode
      MULTIPLAYER, // player vs player mode
      HIGHSCORES, //lists high score
      INSTRUCTIONS, // opens the options menu
      QUIT // when user presses escape key program closes
    };

    //bool MAINMENU;
    //bool SINGLEPLAYER;
    STATE currentstate;






int main(int argc, char* argv[])
{

    //Lets open the window and initialise opengl
    InitGL(1024,768);
    int background = LoadTexture ("./images/background.png");
    int mball = LoadTexture ("./images/mball.png");
    int leftpaddle_2 = LoadTexture ("./images/paddle_2.png");
    int rightpaddle_1 = LoadTexture ("./images/paddle_1.png");
    int menu = LoadTexture ("./images/menu.png");

    //stuff to complete.......!!!!
    //{
    // currentState = MAINMENU;
    //  bool singeplayer() = true;

    //  while  (bContinueGame)
      //{
        //      switch(currentstate)
        //  {
        //  case MAINMENU;
        //      bcontinueGame = MAINMENU;
        //  case SINGLEPLAYER;
        //      bcontinueGame = SINGLEPLAYER;
        //  case QUIT;
        //      break;
        //  default:
        //      break;
        //  };

     // }
    //}

    //variables
    // 'M' stand for metroid....
    float backgroundx = 0;
    float backgroundy = 0;
    float mballx = 492;
    float mbally = 384;
    float ballxspeed = 4;
    float ballyspeed = 2;
    float rightpaddle_x = 990;
    float rightpaddle_y = 20;
    float leftpaddle_x = 15;
    float leftpaddle_y = 450;
    float ballrside = mballx + 40;
    float position = 0;
    float paddle_width = 5;
    float paddle_length = 15;
    float ball_width = 2.5;
    float ball_length = 5;
    float menu = 0;


     do
    {
        //Clear the screen, so previous frames don't build up
        ClearScreen();

        mballx = mballx + ballxspeed;
        mbally = mbally + ballyspeed;


//////////draws images to screen////////////////////////////////////////////////////
        DrawSprite(background, backgroundx, backgroundy, 1024, 768);  //////////////
        DrawLine(512,0,512,768);                                      //////////////
        DrawSprite(mball, mballx, mbally, 40, 40);                    //////////////
        DrawSprite(leftpaddle_2, leftpaddle_x,  leftpaddle_y, 20, 100); //////////
        DrawSprite(rightpaddle_1, rightpaddle_x, rightpaddle_y, 20, 100); ////////
        //Headings and menu items                   ////////////////////////////////
        DrawString("METROID PONG", 64, 64, 5.0f);   ////////////////////////////////
        DrawString("1. Singleplayer", 64, 256, 3.0f);  /////////////////////////////
        DrawString("2. Multiplayer", 64, 384, 3.0f);  /////////////////////////////
        DrawString("3. Instructions",  64, 400, 3.0f);  /////////////////////////////
        DrawString("4. High Scores", 64, 512, 3.0f);   /////////////////////////////
        DrawString("5. Exit", 64, 640, 3.0f);          /////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////


        //highscores
        //{
        //  int iHighscore[6}
        //  int iScore = 0
        //  char scorestring[] = "score"
        //  while (iscore < 6)
        //  printf("Highscore: %i %i/n"), (iScore+1), iHighscore[iScore]);
        //  ++iScore;
        //   for{
        //     (int iHighscore = 0;, iHighscore < 10, iHighscore++)
        //  printf(
        //  }
        //}


        // ball speed/control

        if (mballx > 984)
        {
            mballx = 492;
            mbally = 384;
            ballxspeed *= -1;
        }

        if ( mballx < 0)
        {
            mballx = 492;
            mbally = 384;
            ballxspeed *= -1;
        }

        if (mbally > 1024 || mbally < 0)
                ballyspeed *= -.5;

        // controls for players one and two
        // player one's controls ( 'w' and 's')
        // player two's controls ( 'up' and 'down')


        if (IsKeyDown(KEY_UP))
        {
            rightpaddle_y = rightpaddle_y -5;
            if( rightpaddle_y < 0 )
            {
                rightpaddle_y = 0;
            }
        }

        if (IsKeyDown(KEY_DOWN) && rightpaddle_y < 668)
            rightpaddle_y = rightpaddle_y +5;

        if (IsKeyDown('w') && leftpaddle_x > 0)
            leftpaddle_y = leftpaddle_y -5;

        if (IsKeyDown('s') && leftpaddle_x < 668)
            leftpaddle_y = leftpaddle_y +5;

        // closes program down atfer user presses escape!
        if (IsKeyDown(KEY_ESCAPE))
            CloseDown();


        //limit paddles so that stay with in boundaries placed
        // well they would if i could program
        {
        if(leftpaddle_y < 0)
            leftpaddle_y = 0;

        if(leftpaddle_y + paddle_width > 668)
            leftpaddle_y = 668 - paddle_width;

        if(rightpaddle_y + paddle_width > 668)
           rightpaddle_y = 668 - paddle_width;
        }
        //ball impact values below
        //makes ball go bouncy bouncy
        //collision is surpost to be here...
        {
        if(ball_length + ball_width > paddle_width + paddle_length)
        mballx,mbally = 0;

        // these do stuff
        // without them game crashes....no idea why
        if(mballx > rightpaddle_x + rightpaddle_y)

        if(mballx = leftpaddle_x - position && leftpaddle_y > ball_width)

        if(mbally = rightpaddle_x + position && rightpaddle_x > ball_width)
        return(0);
        }
        //Stop it from running too fast! Sleep ZZzzz
        Sleep(5);

        } while (FrameworkUpdate()); //Do some secret stuff,


        FreeTexture(leftpaddle_2);
        FreeTexture(rightpaddle_1);
        FreeTexture(background);
        FreeTexture(mball);
        FreeTexture(menu);


        //Close down
        CloseDown();

        _CrtDumpMemoryLeaks();

        //Quit!
        return 0;
 }