convert ms sql asp site to mysql php

SImple product display site, requires visitors to have login credentials from site owner, owner contacts visitor by phone or email simple registration process with easy for old people anti-robot script, has admin backend for adding / deleting / editing product descriptions and images (pre-sized by site owner 1 thumbnail and onelarger image) fields such as price, vendor, fullfilment time and minimum order are only available to admin users I am hoping for a simple conversion rather than a joomla etc solution ( too complesx for this customer) I can provide existing ms db as mysql tables if that helps make developer cost lower. I will provide site access for quailified developers who need to see the existing site.