1) look in the hints and tips .pdf for (how to make a HUD)
link: http://forum.thegamecreators.com/?m=forum_view&t=93081&b=21
2)no you cannot make a multi and single player game as one... But you can make a muli then a single player game and then but them in the same file and have... Single player icon and Muli player icon
3) All i do to play over the internet is: I and my freinds use a ,lan over internet program, ican't think of the name right now. But its just like being on a network/ LAN make sure u have everyone thats going to play on the same server inside the LAN over internet program.
4) you 2 (butters and storm are extremly mean to new people)
pain
Me = noob
and i love The TGC : )