Establish your credit so you have at least 5-7k limit on a credit card(s) that you will ONLY use for the time you have your first plumbing/heating/roofing emergency.

I used cash but if I wanted to do it as cheap as possible, I would just go door to door and hand out business cards.

* Networking doesn't have to be empty conversations that happen as you hand out business cards.

(Of course the eviction attorney cannot refer their clients to you - as that will be a violation of attorney-client privilege but the reverse - the eviction attorney passing out your business cards to their clients is totally allowed and legal).Of course, don't expect for this to work with a single phone call.

Get credit cards, charge a small balance, and pay it off every month.  

Getting the cards is simple enough.  

Lets say I purchase a property with one of the following or combination of the following methods: cash, revolving line of credit, private lender, credit cards or SDIRA. 

Side Goal - it would be great if this would  be possible to accomplish while keeping our current home as a rental*Current loan is FHA 3.5%*I do have a job and show a really good debt to income*currently improving credit by paying off credit cards...(620).who knew using the credit someone offers negativly effects your credit even when you make your  payments....enough crying though.....should have this in order shortly.Am I doomed to selling to accomplish our goal or are there any ideas how we can keep this home as a rental, make our other 35K investment, and move to our new home

Your day-to-day personal expenses are covered; you're free from credit card debt and other personal / consumer debts; you're saving in traditional retirement accounts, like a workplace 401k, up to your full employer match; you have a comfortable emergency fund.I'm assuming the real estate market, at this time, is "normal" (like 2014 or 2015).

They will always say yes, because every investor wants off market deals, so then just exchange business cards.