It's so hard to say generally what problems might come up, but the first that comes to my mind is work history - do you have 6 months on the job and a 2 year work/school history? 

I have someone offering me a bridge loan to help solve my immediate needs however they want me to pay nearly $5,000 for a MAI commercial appraisal.

Review the quality of the tenant base (do they have a history of paying on time, what were the original screening criteria, do they have applications on file).

(Give that to sellers, they picket $100k after paying off the loan.) and then pay them 4.5% interest (what they could get from the bank.) now you’re talking $750/yr extra interest, and it’s being paid to family. 

Network with wholesalers, check public records, and use platforms like PropStream or DealMachine to find distressed properties.Be Cautious: Pay attention to permits, inspections, and local market trends—over-improving for the area could hurt your profits.Starting with a solid plan and realistic numbers will set you up for success.

If you were to refinance property one and pull out another 100k (lets assume a 500k house in tampa that you need 100k for a down payment), you'd be paying 6.5% or so on that 100k. 

For instance, someone making $500k a year and living in a very highly appreciating market might be extremely happy on a deal that loses $200 a month but is getting 5% appreciation on a 2 million dollar property in San Diego, butut that doesn't make sense for the investor with 30k and a lower paying job.When it comes to the book series I agree with you that the order doesn't make sense (having read both).

Mind you they'd probably not do it anyway.

They use PRICE LABS to create these score cards that test your price, data is pulled from Price Labs, well guess what you can access that right from Price Labs you do not need to pay them for that.

I have some contacts if you need one.If you need to refinance to pay off the brothers, let me know, I will give you a great deal.Best of luck!