@Muggie_Moo
Hello and welcome to Zazzle!
You have to create one product at a time - choose which ones from https://www.zazzle.com/custom
No - Zazzle does not do any marketing for you. That's all up to you.
Products can take a few days to appear in the marketplace (YMMV - depends on the website indexing)
A brand new store can take up to a week to set up so wear your hat of patience.
No idea how many people come to shop on zazzle - a fair few I imagine
Read all the help files and search the forum for tips and tricks. There's always someone on the forums that can point you in the right direction
https://help.zazzle.com/hc/en-us/categories/202956047-Selling
