Setup Advice

Relatively new to WordPress but not afraid of coding. I’m working on setting up a site that I just needed some advice on how best to set it up. Ultimately, I’m trying to make a very small multi-vendor site whereby there are front-end forms where the vendors create their products. I have it setup as a membership site for the vendors so they pay to join, but there will be no other costs like commissions, etc. When a customer chooses their product, it would sell by PayPal Buy Now.

The products themselves are one of a kind so there is only one of each, so I also need to be wary of making sure two people don’t buy it at the same time.

Any suggestions about a strategy for doing this? I’ve looked at some of the things out there and they either don’t do want I want (or I don’t think they do, I could be wrong) or they seem to be complete overkill.

Again, just looking for thoughts and suggestions.

Thanks so much,
Rob