my advice is for you to stop being there friend you can't continue being that person's friend i believe in karma and karma is going to bite them in the butt
Take a Realtor course.
In the US you need to be licensed to be a realtor. My niece recently got her license. She interned at a realty office. She did a lot of unglamorous jobs, such as stuffing envelopes or running out to get lunch for people, etc.. But she also learned quite a bit about property sales.