What to use when advertising on Facebook groups?

Just seeking a little advice, if anyone feels like sharing. I'm cornering a certain niche within the gaming community, and was wondering what affiliate would be best as far as finding advertisement that would appealing to my audience. There's a lot of different opinions out there, and I have defintiely cornered a market that is mostly undeveloped.. But it's semi-specifc. How do you recommend? f I turn a profit, I'll definitely give you a small, yet generous Bitcoin donation depending how the info fares.. Thanks in advance..