I'd argue that it would be best to really concentrate on CSS and XHTML seeing as that is what websites are made in. I personally dont think that someone "drawing" a website and then basically selling you a picture cut up into bits is a decent template if its not got the XHTML and CSS to go with it, but maybe thats just me!
can u say how to customize it??? or are u referring to the various options inbuilt with it. am referring to customizing the looks.