You need to Roam a lot between the lanes because lane phase is hard for ryze because he aint got a lot of minion farmin skills.Try to last hit quickest as you can and when you got Tear of Godess then you can farm easily so farmin is getting easier but if you play ryze the roam is the most important thing. Later on where you bought some more items you need to Engage every fight with W so they others can attack him but theres no Escape. Ryze is STRONK ap carry because he is an tank aswell if you play him Like me. He deals tons of damage and can tank a whole Team.His Mana is never ending later and he can spam his skills like a mfkin god.