need help with mail account in OS X 10.2

[dum]

if i have 2 mail accounts setup in mac mail on OS X 10.2 how can i:

1. seperate the mail into folders so it doesn't all come into the inbox
2. set one of the accounts as the default account to send mail from


i know how to do this in 10.1, but they keep changing everything and i can't find it anywhere.