One of the fun things about building electric guitars is wiring them up. Factory wiring tends to be simple, minimizing the amount of fussy handwork required. Many manufacturers keep strictly to 'classic' designs, seldom if ever changing anything. These designs are generally simplistic, often crude or even stupid, and sometimes outright flawed. There is no need for you to do this. I don't. Here are some of the things I have done over the years. I don't claim to have invented any of this, although some of these schematics I have never seen anywhere else, and had to derive them myself.
All the little bits and bobs that I used to order cheap from China have become much harder to get. eBay is a shadow of what it was just a year ago, there is not nearly as much cheap loothery supplies. But even if you find something, half the time it just disappears in shipping. Or at least it seems to disappear in shipping - a lot of tracking numbers from China are completely imaginary. As soon as you order something, they issue a tracking number to lock it in. That doesn't mean it shipped, or that it ever will! Fortunately, eBay makes it pretty easy to get your money back from such scammers.