Why not just add a bunch of people, and then post links to websites you want traffic to every few hours or so? Post to groups too.
You can marketing your own profile to promote their business. And close your group public post then make a rules when anyone want to publish their post they need some pay you.
As most people here said direct advertisement is the first way, but remember that those people would block you or even unfriend you for doing that and soon you might see drop in numbers. Also Facebook is cautious about these activities, meaning if you start doing that and one person reports you as an advertiser then your profile might get banned by FB. If you want to do that put them in review terms or a way that it seems it is coming from you rather than just blandly putting an add for all your friends to see. If my friends do that I immediately ignore them or delete them from my list.
This is what you should do to monetize your website: sign up to Adbounds, copy and paste a one-line link on your website. You automatically receive 70% of every click amount and 50% of each display amount which advertisers pay for their promotions, forever!
Well you can try all the methods given here by fellow members and you can try posting it as an ad of what you can deliver through your friends and groups on fiverr. I am sure if your gig is attractive and what people are looking for, they will buy your gig or services. There are many sites like fiverr, however I had good experience with fiverr site and earn quite a good amount of income from it.
Why don't you try Affiliate marketing? I suggest you to choose a product from clickbank and promote it on Facebook. You should choose a product which is offering high commission. So you don't have to make a lot of sell. If you can promote effectively on Facebook you would be able to make more than$10 per day. Do you have any idea about Facebook " Edge Rank"? "Edge Rank" determine how many users will see you post.