If they find something off market and want to do it themselves, thats fine, but I can almost guarantee that unless they're an experienced investor, they're going to mess it up, badly.

@Alejandro Belalcazar Here are a few things you can do, but none of them are a rock solid guarantee. 

* What is your Guarantee?

The Miracle Morning: The Not-So-Obvious Secret Guaranteed to Transform Your Life (Before 8AM) by Hal ElrodFinancial Freedom with Real Estate Investing: The Blueprint To Quitting Your Job With Real Estate - Even Without Experience Or Cash by Michael BlankBoth provide clear and practical strategies that have changed the way I approach life and my real estate goals. 

And no guaranteed return.

This will require the opening of an escrow account, and with that will guarantee at least a few thousand $$ in title company/escrow fees, even if the deal falls through. 

Estate is guaranteed a sale price no less than the agreed upon “as is” value.I fund the entire rehab.If all goes well then we divide the increased sale price at closing in some manner specified in the agreement.

It is a lot of money without any guarantee of getting a job afterwards.At the end of the day, I think college provides a great opportunity to learn and meet people who may one day become your business partner.

None of those are guaranteed but the probability for risk associated with them is inherently higher.

Or you can charge a guarantee fee and put it down in the lease.