Yes you can.
You go to your iPod touch's applications and press sync
It depends on the size of the apps. Obviously, the bigger an app, the less space you have to put more apps on it. You could have hundreds of small apps or just a few dozen big apps.
as much as 8GB
im sorry but apps are only for iphone and itouch
It depends on how many apps and movies you have on there. None, then1750 songs approximately. I have 8g with 3 pages of apps and a movieand have 300 songs with close to most memory left.
If you mean a bitTorrent client (e.g. Azureus or uTorrent), you can't.
800
Buy them from the app store directly on the itouch.
If you can connect to the internet with the Itouch, then I believe you can.
8GB...
If you just want an Ipod to put music on, and you don't want to spend a lot of money, then a 8GB Ipod is good for you. However, if you are going to want to put a lot of movies, applications, games, and songs on your Ipod, you might want to consider getting an Ipod with more GB.