[snipes]

1) Yeah, as CoWGoMoo said, you'll have to download computer players (aka AI, Bots) off the internet. Bots are not official files however (meaning they were not made by the company that made the game), so you'll have to do some stuff after you download them, before you can use them in Multiplayer.

2) Make sure you have the [url=ftp://largedownloads.ea.com/pub/patches/MOHAA_UKUS_ONLY_patch111v9safedisk.exe:30389]1.11 patch downloaded[/url:30389] and installed, and as CoWGoMoo and m1ck said, make sure mohaa.exe is enabled for internet access in your firewall.