Custom front-end form (for products)

Hi guys,

I apologise, I have asked this before but had no joy, and can’t find anything across the internet, nor have I been able to get a variety of plugins to do the job.

I am creating a multi-vendor marketplace (woocommerce and flatastic). I want to create a simple one page form for vendors to upload products. It’s putting people off going in to the backend admin-type area and it’s also quite a lot of legwork.

Anyone got any good tips, plugins or sources that can teach me how to do this?

It’s the last thing I have to do and I’m really stuck.