database reverse engineering + data parsing

I need someone to model a few tables for a mysql database that represent a categorical structure that already exists (think e-bay but not less complicated). After the modeling is done, I need a php script using curl etc.. that will populate the database with the latest information from the site that we are trying to model. We may want a simple administrative page to do some simple changes on the data within the database, i.e. whether or not we want to show part of the categorical structure or not.