Newbie Questions- FB targeting, TeeSpring

Hi everyone, this is my first post after lurking for several weeks. I am new to FB advertising and I am using TeeSpring exclusively. We launched one campaign and had a lot of FB interaction, but few sales. I am hoping to get some quick advise from the experts here on a number of topics. I'd like to start with targeting.

I have FaceSniper and Social Lead Freak as my scrapers. FaceSniper has the ability to scrape "Passionate Fans" and SLF scrapes "Comment & Likes" or just "Comments". What do you guys feel is the best approach to grab a good targeted audience?

After using one of the scrapers, I then get them into FB and work from there. If targeting women, etc., I just use the FB Ad creator to get the audience I am looking for. I have a question about using "Behaviors". I'm thinking about targeting "Buyers", but there are several options there. I can target "Buyers", "Active Buyers", or "Engaged Buyers", etc. Any suggestions on using this (or not using it!)?

What do you guys suggest for narrowing down your targets? How big of an audience would you be looking for with a t-shirt campaign?

I want to say TIA, as I'm sure you guys will have some opinions, or at least I hope so since I plan on using this forum to grow my business and then eventually, help others!