How to become a transitional funding lender?

[Charles Kamen]

Pretty much as the title states - what are the legal requirements to become a transitional lender?  Do you need to become an approved lending institution, or can it be done personally, like private lending?  I tried to do some research online, and while there's a good amount of info on how to borrow, there's not much out there on how to lend.  I'm very interested in getting involved with transitional lending, I'm just not finding much to read about it!