I would like to flip my next few properties to get some cash in my bank account.

You will need to know any taxes and insurance cost along with any management fees, utilities or lawn care you have to pay while owning, along with taking repairs and vacancies into account.

Account Closed I look at them as more motivated and possibly willing to take a low offer since they know they couldn't sell on the mls. 

In fact, not only will they buy me the house (paying the mortgage) but they can pay for my retirement contribution, purchase me a new car, pay for my annual vacations, my medical insurance, my kids college tuition.

I have created an account, and when I put in my credit card info, it did not pass.

Account Closed, are you seeing downsides with J Martin subleasing from you?

Make sure you have an accountant and an attorney, both specializing in real estate. 

Not a specific book but podcasts and discussion threads on how to compute CoC, what expenses to account for and estimating rehab costs were the most valuable learnings for me. 

It's cheap, user friendly and most accounting people are familiar with it, so getting help is pretty easy. 

Account ClosedI don't have a 9-5 job, but I find it easier to just go on Zillow or Century 21 and put the criteria I'm looking for to find deals, since most MLS deals are posted on those sites anyway.