oscommerce tweaks and taxes

I need someone to help me with my oscommerce webshop I need help with: 1. installation of free shipping module -- I want to be able to have free shipping for specific items only and be able to add and remove free shipping status easily from the admin side. Also need help to edit the shipping (english + french side) infoxbox during checkout to inform better my customers during checkout. 2. Tax rate fix. You will have to fix the tax rate for provincial customers. You must set correctly the piggyback tax on tax canadian tax rate.