1. What is the exact error? "A bitmap problem" isn't very precise. I assume you haven't extracted everything.
2. Forever, until you are unbanned from the server.
3. If you mean starting weapon, that is set in the STARTING WEAPONS section in the .scenario in guerilla. If you mean AI, it is specified in the actor_varient tag.
4. Record while they are out- aim to get home earlier than them? Ask them politely to be quieter? You should be able to think of this yourself.
5. Not going to bother checking up on your "other post", doesn't seem like a serious question.
6. AIs do
NOT sync. This means that for example, on your computer, you see the elite shooting you. On the other person's computer, they see the same elite 10m away, dead. Each person fights his own set of AIs, and clients most of the time cannot kill the AIs.
7. Cyborg, Elite, Grunt and Jackal, afaik.
8. As answered, you need to have the maps on your computer, in your Halo Custom Edition\maps folder. Custom maps can be downloaded from here:
http://hce.halomaps.org/index.cfm?pg=1&sid=10