Real estate mortgage notes.
Do you have a link where I can get more information about these?
Not really, sorry. Would be glad to answer any questions, but I don't have any definitive, or even good, websites that discuss. It's such a broad category (you have performing, non-performing, first, seconds, negotiating, reperforming, settling, foreclosing, servicing, etc. etc. etc.) - so many things to know about that it's hard to link to a single resource.
Best I can offer is Google:
https://www.google.com/search?q=real+estate+notesSecond link there is to the BiggerPockets blog, which posts are tagged as "Real Estate Notes":
http://www.biggerpockets.com/renewsblog/category/real-estate-notes-2/Hope that helps!
Venture Capital. Let the good times roll!
So much of this is who you know - I'd be hesitant to plunge in without a good, established network. Maybe you have that though. :)