Hi Donna,
Thanks for considering us!
You'll need to find your own publishers, but we give you tools to help you, such as a customizable registration page and our Post-Purchase Channel to turn your customers into affiliates.
Regarding the sales limits, we do not automatically upgrade you (that would be rude), instead we'll notify you to ask you to upgrade. More info on that is here: https://refersion.uservoice.com/knowledgebase/articles/359699-what-happens-if-i-go-over-my-account-limits-in-sal
Hope it helps! :-)
Alex