Yes, the startup I am working on is a marketplace matching buyers and sellers. buyer pays the seller service fees to my site, then the site holds the money unt

Yes, the startup I am working on is a marketplace matching buyers and sellers. buyer pays the seller service fees to my site, then the site holds the money until it's done, then site payout the seller minus the site commission. so it's similar to odesk or zaarly fee structure. I can do it this way, or if not, have buyer pays the seller directly and then I charge seller the % monthly. How do I payout using other alternative like wire transfer or mailed check if I use Balanced Payments? how do I get insured to ensure I am covered for fraud or other risks? I am not familiar with these side of entrepreneurship, the legality of running an online marketplace. Thank you for your help.