With a question like that, don't spend anything yet!
It's obvious you barely have any knowledge and fb ads will burn your money even faster!
Of whatever is left after the hosting, website, plugins etc you won't even have enough left to do fb ads.
Any paid advertising is about split-testing to get data and that can cost a lot of money.
Besides all that you better make sure your website is finished and up to par. So clear shipping info, TOS, Privacy, disclaimer pages, clear layout, professional looking brand etc.
Read my dropshipping thread if you haven't already and start looking for nulled fb ads courses and join fb ads groups and at least learn the basics before spending any money and winging it on the go.