how ot create a customised default theme


I use Sites Pro to sell a very basic subsite to memebers that are not technical at all.

I would like to have it short and sweet. Like a one page theme that I would already have customized a bit with colors, pictures and default text.

I od not understand this part of the plugin. It seems that it let all options to the users with all included templates. Basically, I would just need them to have the right to edit the home page content and that's it.