I want to edit the styles & templates. Where are they located?

[typecast]

I just want to be able to actually see the design as it is happening locally on my computer. I want to download the css and html pages, modify locally and upload them back to the server.

I can't tell which files are the correct ones or even which directory they are in. I don't like using the style manager because I can't see my changes on the fly.

Can someone help me?

Thanks