1 - can't speak for everyone, so... Atleast me, I didn't donate for anything I have... There are alot of people like me, and there are many people that donated for their gear... Can't really tell much more...
2 - No.
3 - Yes, it's very active... You'll never have this problem in the future...
4 - On Icecrown? No... Some people make some posts here recruiting people to do that, but it's a real minority... like 4-5 players...
Which server? Only you can answer that...
- Do you like taking a long time reaching 80, raids really buffed, and progressive raiding? Then by all means, go to Lordaeron.
- Do you like quickly level up, normally "buffed" raids, and no progressive raiding? Icecrown's the choice for you.
Just one thing, being 18 means absolute **** about someone's maturity... I had to say this, sorry.
I think I didn't miss anything, if anyone remembers something else, please add it.