Check out the numerous online forums for tips. Road Cycling UK is a good source of information and they welcome all number of questions and requests for advice from new riders:
RCUK Forums
FWIW, the best bit of advice I could offer is to simply get out and ride. That sounds a bit corny, but I've found that nothing beats experience. From kick-off, be assertive in your road positioning and don't ride in the gutter. At least two feet from the kerb would be my suggestion, though I often ride near the middle of the lane when there are parked cars at the side of the road, or traffic islands etc.
Take it easy, and obey the rules of the road (don't jump red lights or hop on pavements too often etc.). That way, motorists will be inclined to be more respectiful and give you room and time when required.