Ouch, deleted this post by mistake.
You can sell other people's products by linking to them with a special code in the link. When you do that you are selling affiliate products. No stock, no support 🙂
Join affiliate programs for free. For your movies you could join amazon.co.uk or .com and perhaps later www.ebaypartnernetwork.com. You might also try other sites like Blockbuster (which you mentioned). Look for “affiliate” or “partner” on their sites. If you cannot find it, you can do a site for “affiliate site:blockbuster.com” or whatever site you are trying.
I cannot remember if I wrote something else, but feel free to ask questions in the comments.
Oh, yes, payout … sometimes you're paid to Paypal each month, sometimes you have to have earned a certain sum before payout.