mademetop - 9:00 am on Jul 18, 2011 (gmt 0)
You are in a very tough and highly competitive marketplace with competitors who would think nothing of spending 7 figure sums on internat marketing a month globally.
Without knowing specifics it is impossible for your questions to be answered. However your best best is to go to established internet marketing companies and invite a tender. Lay out in the invitation what you are hoping to achieve and shortlist the replies. Check references and make your choice.
Only those companies who understand what you want to do can really give you advice on how to do it.