I need some advice on how to attract certain traffic

I'm in the middle of getting my site up and ready for a launch, and I desperately need an SEO expert to get affiliate publishers and online business owners to post jobs on my site.

Affiliate publishers/Business owners in need of

-Articles Written
-Craig's List Posters
-Facebook likes and comments
-Titter followers and posts
-Bloggers
-Forum Posters
-Bookmarks
-Download/Installs
-Sign ups
-Voting & Rating
-Mobile Applications

and just about anything they ask for

This is a microjobs/crowdsourcing site that needs help launching and I am really stumped on the SEO Optimization for this.

I'm not an expert on advertising for this specific group of people. Anyone with some sound (and respectful) advice?