Welcome aboard. The Show is truly amazing and you will not regret your move.
As far as rosters get Knight and co.'s version 2 best roster set ever. Has all correct player on correct teams. They truly are the best out there.
There are plenty of thread on this forum that will help you out as you get adjusted to this game. It truly takes patience and love and alot of practice.
Read thru all the tips and work arounds thread it has a great list of helpful things. Also if you need sliders I think Psychobulks are the best but that is just an opinion thing.
If you have any problems or need help just pm me or whatever and I will help where I can.