Go on mid and try to overfarm your enemy. It's easy- just keep him on distance with Transfusion. Try only to lasthit minions, also with Tides Of Blood. Don't use it too often- it cost you health. Later it's good to cast Q end E together. Use your ulti in teamfights as often as you can. Use Sanguine Pool to escape.
Warmog as last item is optional, u can buy item, which match game better.