I start off with the dorans ring for obvious reasons, then i lane as long as i can supporting my partner. when the time is right i go back and ill ocasionally buy a couple health pots if my gold allows it. then ill go ahead and buy 2 more dorans rings as they supply me with the stats i need early game to get ahead. after ill usually be laning for a while maybe help set up some ganks but mostly supporting my partner(a carry suggested) to help feed him. after that ill go ahead and buy my boots of speed and hopefully enough to get the catalyst, then i will continue my build as shown above and sell dorans rings only when space is needed. once you get the last item in the build it is up to you what you want to do, you can keep your cdr capped or you can sell your boots and buy another rabadons or rylas but it is entirely up to you.