Seller Financing - Where to start?

[Jeremy Hair]

I'm working with a tenant who wants to purchase the home they are currently renting (and I have a mortgage on). I'm open to it, but not really sure where to begin. I know there are companies that will service the note, but I can't seem to find them. Additionally, I'm trying to figure out how to know if my current mortgage company will allow me to do this. The lease won't be up for another 6 months, so I have time to figure this out, but I'm just trying to learn where to start. I've read several articles on here, but they are extremely high level and leave a lot open. Do I reach out to a title company? A lawyer? Find a servicing company? Looking for some real direction, if anyone can offer it. Thank you all in advance!