I am about to start Dropshipping with Shopify

Hello Guys,

I have been working on Shopify store since last few days. I am going to sell products in USA, UK and Canada (mostly USA)
Setup done - Payment methods, shipping methods, oberlo settings, product reviews,etc.
I am ready to market these products now. I am thinking for Facebook Marketing.
Any recommendation/Suggestion you want to give me.

This is the first time I am doing Dropshipping, so don't want to fail.

Thanks in advance!