They're easy enough to plug into the property calculator, but having the right numbers seems critical to success.

When I lined up my PM, I got a file (large one) on every area they PM in, that showed me the rental comps broken down on a map (critical...zip codes alone are useless) for different sizes of properties. 

Its times like that, that they have broke even or even lost money, so its critical that you get very good at accurately estimating the rehab costs.

You will much rather find an advocate than a critic. 

Or switch the order on that, but I believe finding your own deals would be the most critical thing you can learn right now that will help you achieve financial freedom fast. 

It got messy for a while before I achieved critical mass with payroll vs revenue but now we have quality control, internal training, great culture, and are able to innovate with great people. 

Be sure you use critical thought on everything you are told by anyone.

Starting with a plan and understanding the ins and outs of the tools you have at your disposal (I.e. the VA Loan) is also critical.

Networking with other real estate investors is a critical piece of being successful in this industry.  

I know many investors like to be 'all in' in some form of investing, be it equities, real estate, crypto, gold, etc, but personally, I think that diversification is critical to protecting your assets.