Most tips you'll learn either on your own or be spammed with(wards, watch the map, learn to last hit, etc etc) but there is one piece of "advice" I know gets spammed to hell at low elos that I'll go ahead and counter. When playing AD carry, build AD mainly, not AS. Positioning is important, and AS builds only do higher damage if you stand still the entire time you attack, which will get your squishy ass killed against people who know what they're doing.
Okay, now advice on champion choices... Warwick currently is outclassed pretty much everywhere, and has difficulty with his sustain top. I'd probably replace him with someone else. I'd probably go with Trundle, Skarner, or Mundo. Kennen as an ADC is a trap, so if you want another champion to cover that whole, switch him out for someone else. I'll recommend Draven, not so much for how good he is, though he's certainly viable, but learning when and when not to catch his axes is actually good positioning training for every other ranged carry.
Actually, on that note, if you want to better learn the basics of the game, I recommend you pick up Draven and Shyvana, as mechanically they encourage things you want to be doing anyway.
Okay, now advice on champion choices... Warwick currently is outclassed pretty much everywhere, and has difficulty with his sustain top. I'd probably replace him with someone else. I'd probably go with Trundle, Skarner, or Mundo. Kennen as an ADC is a trap, so if you want another champion to cover that whole, switch him out for someone else. I'll recommend Draven, not so much for how good he is, though he's certainly viable, but learning when and when not to catch his axes is actually good positioning training for every other ranged carry.
Actually, on that note, if you want to better learn the basics of the game, I recommend you pick up Draven and Shyvana, as mechanically they encourage things you want to be doing anyway.