I believe that you don't get returns (failed to deliver) with bulk mailers so you don't know which addresses are bad.That's the simple stuff.My advice is to do various mailings that you or some prepares locally, that go out immediately, using 1st class postage.

For example, cheap goods at Walmart let people buy more cheap crap but at the expense, at least partially, of good manufacturing jobs that supported local communities. 

Please do this first:  contact the local Housing Authority office in your market area and obtain the landlord package.

I’ve invested locally in SFH.

SignaturesThis Agreement is binding upon the parties and their successors.Contractor Signature:[Printed Name] [Date]Subcontractor Signature:[Printed Name] [Date]AttachmentsScope of Work document.Project drawings/plans.Proof of insurance and licenses.Payment schedule.Note: This template is for informational purposes only and should be reviewed by a legal professional to ensure compliance with local laws and regulations.

Great idea, but check your local regulations.

If you're only really working your local market, and mostly driving for dollars, and want essentially a 1 stop shop that can do most things pretty well, then Deal Machine should work for you. 

Usually, the confidence comes from more reps (seeing more homes and being more of an asset hunter not a spreadsheet warrior) and going to local meetups so you can meet all the other people nearby who are doing what you can't get yourself to do.

Super nice guy, and a genius.You can also go checkout Divorce Lending Association and find a local CDLP if you'd prefer.

In any case, I thing your investment are pretty solid and should earn you something between a decent return all the way to a spectacular return depending on the local economic situation.