Whenever a thread like this gets posted, I always add this piece of advice:
Read the forums.
Ream 'em again.
Go back and refer to them as you go.
I'm a geek, but I spent two months devouring the forums before ever taking the plunge to play HBD (the only game I play on this site). That, more than anything else helped me hit the ground running. I know my situation is unique, but I managed to pick a pretty good team and made a couple of trades at the deadline to push me over the top. Won the WS my first ever season. Most of that, of course, is luck, but I have zero doubt that going through the forums is extremely valuable.
Even though I made those trades, I'm still a believer in "less is more" in your first season with a franchise - mainly because I know most people learn things by doing, not reading. I'm a 'book learner' so for me I had to get as much info as I could before starting.