Mapping is fun. Its aways great to see another give it a try.
What you want to do is right click in a 2D view. A menu will popup with several options. Follow what was posted by navigating to info>player. Then select the type of spawn needed for your style of map. By style I mean TDM, OBJ, FFA, or SP.
This should help also:
http://users.1st.net/kimberly/Tutorial/playerstart.htm