I've done commissions myself for a while and also commissioned lots of others, so I kinda know what works and what doesn't. So why not do a tutorial for it and share my knowledge? Keep in mind this is just based off my experiences and may be different from what others say.
Figure out how you want to do it. There's several ways to set up commissions and in my opinion making a journal for it is the best way to do it. You can use the widget to put on your page, but people tend to overlook those and if someone asks to see your commissions there's no link you can give them. I've personally never commissioned someone through a commission widget. I don't notice them and they're just weird in general so I stay away from them. One way I've noticed people do it is by having a stash document just like a journal, but a journal that was never submitted. I don't mean to offend anyone if that's what you do, but I think it's the absolute worst way to set up commissi