E-commerce Help!

Hi All! I have a question… I have a new client that wants a online store website, I know just the basis of PHP and MySQL, and I have never done this before… but searching on the web I found a lot of full e-commerce services like “Yahoo! Store” Can you tell me how is it? is it easy to create, is it secure? and can I customize my design? any other way I can build an e-commerce store?
pleaseee help me with this! :hangover:

Kissis and hope answers soon :azn: thankssssssss!!

Euge from Argentina

(sorry for my english ok? :p: )