Wordpress payment page help needed

Hello, I dont really use CMS much, anywayy I have installed woo commerce as a plugin to the wordpress site,

Basically what i need to do is create a payment page where we can set the amount a customer has to pay or so they can input how much they have to send themselves (whichever easiest), they aren't paying for a product or anything they're basically just paying a bill as such

Whats the best way to do this? I've thought of everything but nothing practicable, is there another plugin which does this

Any help will be appreciated +1

Thanks, Gary

Edited July 21, 201214 yr by web-itec