Erik,
Welcome to BP! That's a good word from @Andrew Angerer. I agree with everything he said and I, too, thank you for your service.
As far as conflicting information and a lack of a step-by-step process, you're certainly not the first to voice that frustration. One problem is strategies that work well in one part of the country simply won't work in another area. In addition to that, one individual might be perfectly situated for one strategy, like flipping, while another is better positioned for something else, and both will find success doing very different things. For someone just learning, it can be confusing and frustrating.
As far as getting your license, it CAN be a good idea, but it can also be a complicating factor that makes growing an investment portfolio more of a challenge. On this side of getting my license and working in the industry, I can tell you it's not a clear black-and-white decision where having your license is obviously better. There are many disadvantages to having your license that I wish I had better understood.
Some of it depends on what you want to do and the long-term route you want to take. Colorado Springs has about 4,000 licensed real estate agents and 94% of first-year licensees will not renew their license (per the local MLS).
As an example, I was recently invited to partner on an off-market wholesale deal that I had to decline because being a broker was a complicating factor that would unnecessarily hinder the deal. It was already under contract and we would have had to do additional disclosures that would necessitate us amending or re-writing the contract.
I've also heard of several agents getting in trouble for buying off-market properties at a discount because the seller later felt taken advantage of and complained to the Realtor association. The Realtor association feels that licensees have an unfair advantage in the marketplace and buying homes off-market at a discount is often construed as taking advantage of the public. One way I prevent this is by having customers sign even more disclosures telling them what their house is worth on the open market and what I plan to do to it, which sometimes creates opportunities for the sellers to object.
On the other hand, someone who is flipping lots of properties every year can significantly reduce their transaction costs by flipping. They cannot, however, contact homeowners directly who are listing with another agent, which is something un-licensed flippers often do.
Whether you get licensed or not, the information you are learning is valuable.
I'd be happy to discuss real estate investing in greater deal with you sometime and show you the exact steps I and others in Colorado Springs have taken. I have experience in every strategy you mentioned, including commercial. I don't know everything there is to know, but I'm happy to show you what I've done.