Don't forget to look at your team page regularly. It has your roster and lineups, links to various reports about your team and e-mails. E-mails can be status updates from the minor league managers or trade offers from computer teams.
As an example, this is one this last week to the Seattle owner:
DATE: Friday, 5/3/2006
Trade offer
Dear Sir,
I would like to offer you following trade:
SS Moises Machado
in return for
SP Scott Shrewsbury.
Please let me know if you accept!
Best Regards,
Arizona GM
Look at the players being offered (sometimes they are in the minors) and see if it is a trade you want to accept. If so, just let me know so I can enter it in the system.