Affiliate Marketing Secrets

I feel like there’s this wall between starting my idea for a niche social network & finding a coder or web developer. (This is my third question about this subject). I don’t want to use those sites that have a basic social network all set up for you. They are crap, am I wrong? I need 1-3 good coders & a good web designer. I don’t want to find a company full of coders & designers because I cannot pay one up front. I will already have to pay for a domain name & eventually find investors. I’m not asking for a coder to work FOR me for free, I’m trying to find one to work WITH me who would eventually make a percentage of the eventual royalties. Most likely they would have a larger percentage than I would since they did a lot of the time-consuming work.
Is this possible to find a coder & web designer willing to do this?? If yes, should I try to find one through people I know? Where else could I look? Should I post on Craigslist? Should I have my idea perfectly written & planned on paper first (already in the process)? Should I skip all this & try to sell my idea to Google? lol
I’m totally clueless about the creation of a good social network, so be gentle.

I want to start a social network. Maybe not as big as Facebook, but a niche social network similar to goodreads.com or something along those lines.
How many coders do I need?
Would they be willing to donate time if the idea had good potential?
How would I find coders? Colleges?
Do I also need a website designer?