What's the syntax for variables in an MSSQL stored procedure?

select * from mytable where id > 8

declare @myvar int
myvar = 8

DECLARE @MyVariable INT
SET @MyVariable = 8

declare @myvar int

Set @myvar = 8

select * from mytable where id > @myvar

declare @myvar int

select @myvar = 8

SET @one = 1
SET @two = 2

SELECT @one = 1, @two = 2