Costumising Blog

Dudes.
I know XHTML and CSS. I could probably learn PHP. Why not I say.

My new word press here https://www.donroche.com/newblog/

I want it to look like I customised myself. So it would look something like,
https://www.donroche.com.

To put it simply, any tutorials where I can learn how to do this? I want me own header, background, menus….

Basically build a site around wordpress.