Stock Membership Site Creation

Hey fellow marketers.

I'm a marketer in the video graphic niche and so far I have seen some results making some digital products that have sold doing product launches. I'm now looking to do a membership site with video/photo/graphics that offers monthly or yearly subscriptions. I'm quite good with video and graphics if I say so myself and I taught my self most things about Worpress, coding my pages myself in Bootstrap and have a good knowledge on membership site creation like DAP and more. So I'm thinking about doing a stock site with one of the follwoing: photos, video or graphics. Hell maybe even all of them.

I've been googling things on this but one thing I can't find : How obtain this stock!!

Even though being a designer myself...it's going to take years to come up with let's say 1.000 elements that I would think was the minimum to get started and then add ontop of that.

Does anybody know the way to get started. Do people buy stocks with reselling rights or create them theirselves. Is drop-shipping infoproducts possible? Or should I go with inviting people to upload themselves and take a percentage? Any info welcome.

I want to get quality templates for example to sell. I guess the fastest way to grow would be to invite people to sign up as users and then let them get percentages. Is that process easy with wordpress templates these days. Is my webhost going to kil me if it's let's say - video files?

Anybody with experience. As I say, I don't need info on membership sites - I need info on "how to grow content on your membership site" because people are not going to sign up for stock sites unless they are getting a good deal with alot of quality stull.

My hosting says unlimited bandwidth and storage yari yari....but I guess a membership site like this would really test that claim

Thank you in advance!