Honestly, it’s not going to happen. You’ll have more money invested in getting it street legal(ish) than it’d cost to get a legal one in the first place.
I think it mostly would just need the lights, but they’re $$$$. I also don’t know what the title is, it might be off-road only or something. I could ask, but I don’t think it’d be a good idea to turn it into a street bike.