Load (implement) on website to sell photos for download. How can i do? I don´t know to use my web.

I need to run my website to sell photos, and perform registrations with clickbank, paypal and 2checkout. Only need to upload photos to this website that is ready to download, edit photos with features for image quality (eg photo 1mb to? $ 2,? 2mb? to $4, etc) similar to the most well known websites. It is very urgent because this service is less than 2 weeks to start functioning.