Help

I have changed to beta blogger and I was going to change to the so called easier custom option, well I made the initial change and of course my background image dissappeared(not a bad thing for some people) I went into the edit HTML code part of the template and ARRRRRRRRRGHHH I didn't understand a thing, my HTML is bad but at least I know how to add an image to my background, but with the new HTML and widget editor I haven't got a clue so I had to change back to my old style template, looks like I will have to do alot of reading before I attempt the change to the MODERN way.