create a website

I need a professional to set up a website which it can - play audio/ music file -sell audio file -process payment? - I can update the info/audio once it is set up I am a musician, and I produce my own music, I would like to have a website which allows me display my music, and viewers can listen to my tracks(demo), and able to purchase and download onto their ipod, and able to process payment. I would also like to be able to add on new tracks or information myself once the website is set up.