If you are doing a money league, I would advise you join a free Yahoo one just to get used to the software, the time constraints, etc. It will help in the prep.
As to what to bring, if it is online, I usually have printouts of my rankings and Projections by position in front of me organized so I can find them quickly. And IE windows open to online references for quick lookups.
If your on a computer you want to have mlb.com open and try to investiate a player's injury status prior to selecting him. Team pages will tell you if a team has contingent plans for replacing an injured player. This will keep you prepared for dropping a players rank accordingly (like Gagne last year).
I like to have everyone healthy to start a season unless I'm taking a late flyer on an injury risk who may return mid season.
In addition to my draft list organized by position, I think it is also important to have a piece of paper that lists C, 1B, 2B, SS, 3B, OF1, OF2, OF3, U, SP1-5, Closer 1-3, etc. Once you make a pick, cross that position off. I know Yahoo has that little indicator on the screen, but sometimes it slots a guy differently than you would and the slip of paper is more convenient. You don't want to be stuck with only 2 rounds to go and you don't even have a complete starting roster yet.
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I agree with everyone, but also try not to overload on lists/rankings...have one or two main lists to actually keep track of the draft with...I usually use a positional ranking and overall ranking list to mark off who was chosen....well really I start off with two for the early rounds and then rely on solely the positional sheet for the later rounds.
Too many lists and you'll go crazy...as I is I feel like a zombie and am very drained after a draft.