Website development.

I have a website, made myself with 'create.' My business is growing well, and the web site handles 90% of my sales. I have recently set up a service with cardsave / streamline / worldpay to take cards, but I don't have a clue how to get it going. I need someone who understands this set up system to take over and get me up and running, and also make improvements to the site. Would like to pay a fixed price. I'm sure theres not much work for someone who knows what they are doing!