Can I set up how I pay per sell per affiliate?

Hi, I have currently installed the affiliates plugin but I got some questions.
1. Is there anyway that I can set the amount that I should pay per affiliate per sell?
2. Is it possible to create a customize registration form for the affiliates? It is, how?
3. I have currently marketing our outsourcing services, we have a pricing table where our clients can directly through paypal or credit card. In short, we don't need a membership site. My question is, will it still track on our affiliates' report per client sign up?

Thanks.I hope you can help me with this.