You don't combine credit scores to qualify for a loan. 

I've enrolled myself in school to take a real estate course to get my license (cause I read somewhere, that that was necessary) and a business management course along with an accounting course to freshen up on my skills.

Background: I`m trying to access some of the equity sitting in my rentals to re-invest, but my W2 income is fairly low compared to the rental and self-employment income, due to higher deductions the total taxable income and qualifying rental income is way less than my actual income.

I really had no idea how long it would take to ramp up my knowledge, network and at some point actual skills!

You should then qualify for home office deduction and your trips from home to the job site and back will most likely be deductible.

They request what is called an “as-repaired appraisal.”To give a general picture of how the as-repaired appraisal fits into the process here’s a very basic look at the steps involved in a standard 203K loan, sometimes called a Consultant K* loan:The borrower selects a property, a lender, a 203(k) consultant and a general contractor.The lender pre-qualifies or pre-approves the borrower, and determines that the property is eligible for a 203K loan.Working with the consultant and the contractor, the borrower submits a document that specifies all repairs.The lender requests an appraisal.

What skills do you have in doing the work or managing others?

Closing cost were less just both attorneys and assumable mortgage with qualifying approval .

Anything that will educate me and train my skills?

My main piece of advise : As a new investor it can be really hard to wait until you have the capital to get started with something worthwhile, so focus on your research and on building your analysis skills, focus on the numbers and doing conservative math (ie don't include rent increases or appreciation, which are never guaranteed).