basic team selector 1.7 compatible

Step one create team:
/scoreboard teams add blue

Step two set color
/scoreboard teams options blue color blue

Now you ready to start

1. Place two commandblocks ontop of each other
2. Place a preasureplate on the top one, anyone stepping on it will activate both blocks.

Top command:
/scoreboard teams join blue @p[r=1]

The r=1 is to ensure that only the player within a 1 block radius is added to the team

Bottom command:

/tp @p[team=blue,r=2] x y z

So only a player that is in the blue team that is within 2 blocks is teleported