It is suggested to start with the basic standard Windows interface and use the Koda interface designer in SciTE editor to design standard forms. Only when we are proficient can we begin to make this advanced form interface. It's hard to get there in one step.
There are few video tutorials in au3, and most of the posts on the forum are graphic tutorials.
The following is an example given in a post on the forum-self-drawing 360 style buttons, which should be closer to your requirements.
Button pictures are all in png format, and other software such as? Axialis IconWorkshop? Make another one.