Look at how you will be useful: who to gank, who to

ward for, who to play with. Understand your job from the draft: tempo and aggression, or protecting your own cores and reacting to what they do. Plan ahead how you will stand the lane: static, or will you break the lane and pull the creeps out from under the tower? Do you need to stack the camps on the offlane or control the water runes for your mid?
During the draft, look at both drafts and work out what jobs you have to do in this game.