Change Template in a Virtuemart Site & Modify

Hi, i have a website im building in Virtuemart 2 and joomla 2.5 platform, but i dont have the time to make some changes and modification, at the moment i have build categories and my client started adding products, i dont really like this template and i want to install another one i have found, and make changes over this new template and install some virtuemart components, mostly for visual adjustments (some of those i already purchased and i want them on the new site, like the ajax cart i have)