Much like flash stated, I would start by finding a good supplier for the products you want to sell and then ask if they do dropshipping, preferably blind. Start by researching suppliers for your specfic niche through google or this site. Once you find one, make sure you research their policies good, from shipping time to methods of payment. This very important for long time success in dropshipping.
Heres a good wholesaler for tactical gear tacticalgeardistributors. Apply to become a dealer. Great quality products.
PM me, I can hook you up with a couple reliable wholesalers Ive used in the past.
Goodluck.