Affiliate Marketing Secrets

I have a product idea that I am considering selling through Clickbank. I don’t expect it to be just a HUGE seller – it’s in a craft niche and I know that’s not one of the better ones, but I know a lot about this niche and can create a great product. There doesn’t seem to be anything comparable on CB.
But I thought this would be a great opportunity to ‘get my feet wet’ in this area of IM.
What I am wondering about is if a product has a gravity of 10 (that’s just an arbitrary number), what does that represent? I’m just trying to get an idea of about how many sales are possible, although I know that no one can really predict this.
My other question is how do affiliates find the product to promote it? The reason that I want to go through Clickbanks.net is so that I can focus on the product and affiliates can focus on the promotion, right? So, will I still need to go out and find affiliates?