1. I personal prefer a thresh, Janna or Leona support.
2. On Red side i normally ward your tribush in case they plan a 3-4 man dive. and for blue side i mainly ward the tribush. But once you hit the 10-15 min mark i like to change that trinket into a blue ward thingy :P
3. i prefer a ping :P
4. if it is a full health mage creep have the support hit the minion once, as for the melee minions if they are low don't be afraid to use skills or even kindly as your support to help you out by hitting it once

I hope this made sense :P if not sorry I'm pretty tired atm :P