The biggest problem here is how to do it to the standard you require and not get kit which is either too good, or not good enough, to begin with.
You don't want to waste money buying anything that isn't up to the job, and then spend even more to get kit which is perfect.
But it's also just as big a problem spending hundreds, if not thousands, on stuff which you'll never use or is over the top for your requirements.
I definitely wish I'd found this site before making some of my purchases as the advice I've received since has definitely made me think twice before clicking 'buy'.
Interestingly, I was watching a lens review yesterday and randomly a video popped up about how to take portraits using only a speedlight (and various other modifier bits) which might be worth a watch.
I'm not saying this is the correct way to do things, but as some of the advice is about doing it in your living room instead, and this is literally shot in the guy's living room, maybe it's worth 20 minutes of your time. Watch the whole video, but here's the link to the kit list:
View: https://youtu.be/nuoc53wcnbc?t=1084