How to test my zazzle designs?

Hey BHW, hoping to get some advice from the gurus around here. I've made quite a few zazzle designs lately, and I would like to start testing some of them through FB Ads. I was planning on testing for a week at $10 per day in ads. Is this a good option, or should I go about it differently? I've never used FB for marketing before but I've seen that people around here are doing well with it. Any suggestions/ideas welcome! Thanks in advance.

Do you have a specific niche?

I would try to verify the designs with free marketing first. If you get a few sales and you know that it is working, start with FB Ads.
In case you have a targeted audience think about using Facebook UID Scraper to build a good custom audience.