How to use a web template?

i purchased a subscription from a web template store online and now am using one of their templates, which is flash based, to create a website for my company. The page file is designed in Photoshop. I want to make changes in the photoshop pages, obviously, to customize it for my company. I have also adjusted and edited the Flash doent to make it customized for my company. Now when i load the html page, the unchanged flash plays. How can i find where to link the flash to the Photoshop page? I also need to know about CSS Stylesheets. There is one for the page in the folder I downloaded but don't know what to do with it...is there some way to APPLY it to the html or dreamweaver page? HELP. I know enough to be dangerous but not enough to really know what I'm doing.