If you truly have no idea, then the best thing to do is probably to take a ranking or mock draft (such as this one
) to your draft, and always draft the highest player on that list who is still available unless you've already filled all your slots at that position (for instance, if your league starts three OFs, don't pick up more than three before filling every other position).
That, and read as much as you can. Try a search for 'draft' and 'strategy' in these forums. You'll come up with a lot of posts, and every one you can read will give you a little better sense of the game, even if some things might be confusing at first.