I have posted a few properties and have received numerous leads.

You could ask a local Realtor for contact info if you can't find it with a web search.It might help to know that there isn't one single MLS.  

If you go this route I recommend you google "introductory HELOC Los Angeles" and there will be numerous banks and credit unions that will have an introductory offer of 2.99 or 3.99%.My recommendation is to reach out to a mortgage lender both here in Southern California and out of state (depending on where you want to invest) and determine how much you'll qualify for based on your current numbers.While it will be a process to get everything figured out the key is to take action. 

@Grant Rothenburger to be honest I'm not sure as there are a few established companies such as; Realty Mogul, PeerStreet and Fundrise that will most likely endure, however, there are other smaller companies that have either recently gotten into the space or are trying to get into the space and just won't make it based on today's margins.Don't get me wrong I think the real estate crowdfunding space will stick around and numerous companies will come out successful, however, the companies that are full of generalizations, estimations and marketing will close fairly quickly.Since I have very limited investments in this space I'm not sure which ones will consolidate and which ones will close in the near future.FYI, I have no affiliation with Realty Mogul, PeerStreet or Fundrise.

I've not used one but I'm seeing them more and more on web sites.

Creating numerous LLC's for a growing portfolio will eat up much of your margins at a minimum 800 dollar annual filing fee per LLC. 

Some of the pros: among all the PM companies I reached out (lazily, through email or web forms), they were the only company that responded, and did some in a timely manner (I reached out over the extended weekend, they called first thing Tuesday).

No one formula works because each situation is unique.For example, the value will be determined by these variables, as well as numerous others : likelihood that note can be made re performing, amount of time in default, owner occupied or not, stage of foreclosure, foreclosure laws of the state property is located in, if the debtor has filed bankruptcy, financial condition of debtor, whether or not there are any guarantors, type of area the property is located in, equity in the property, balance of the note, interest rate of note, default rate of interest, communications with borrower, residential or commercial, if residential was the note in compliance with Dodd Frank, did it pre date Dodd Frank, or was it an exempt note, note documentation, chain of title, availability of original documents, robo signed or individual signed, title insurance.

@Angela Russo we are actually only doing form fill campaigns at the moment (I am working on a website at the moment and am actually taking a class on web development to help as well).

Listed properties on the web is an option that has worked and still works for many investors.