buying media

we have some budget for buying ads to promote our b2c store,but we need to focus on one social network,so we decide to choose from youtube channel and facebook ,but still don't have experience on these two channels.so guys which channel is better for buying ads to promote a b2c store or sports...

Guys Let say I have a 2% CTR and I get .50 cents clicks on a Facebook dark post campaign (obviously targeting a custom audience) that means I need to spend $50 dollars to get 100 clicks just to sell two products... If my product cost $20 dollars... I'm screwed! There isn't an affordable agency...