combine sales page and ebook

I have an ebook that i have written ready to be put on the web for people to buy. I have a simple sales page written (1 page long). I need someone to simply insert a link on the sales page where customers will be taken to to complete payment and then on completion of payment taken to another download page. Some of the work needed to be done here may only be advice to be give instead of actual practical work. I have a server account set up also and am ready to put the ebook for sale on the web as soon as this last little problem is sorted out. This is a very simple project and should take anyone who knows what they are doing 20-30 mins to complete. The winning bidder will receive the sales page to be modified on acceptance of bid.