For Filesharing startup you need following
1) Minimum 25-50K Investment money to buy B/W , Hardware, Affiliate payment etc.
2) Arrange a Good Lawyer, as you may need it soon.
3) Be mentally prepared to suffer whatever the outcome is
4) Look for good DCs with nice peering to whole international locations. Don't count on 100TB deals
Warning : Lots of people failed with a filehosting startup, there are examples here in WJ too. I can't mention username. If you have 25K-50K invest it on some offline business, it will be much better.