Legal question for massaging

[Improv Geek]

So I'm a college student who has been told I'm very good with my hands and massaging people. And I'm considering trying to sell massages to people at school but since I'm not trained in Physical Therapy and such I wanted to see if anyone had knowledge of what I would need to do to protect myself from lawsuits or anything.

I mean it's not going to be a big business or anything, but if I massage someone and they get hurt what am I looking at? How can I prevent being sued and such?

My thinking is I'll have to be pretty formal about it and make sure I tell everyone up front and am very clear that I am not a licensed practicioner, perhaps even get a paper written up for them to sign.

But what do those who know infinitely more than I know suggest?