I know that many on these forums advise not to get too bogged down with info and that since nobody will ever know all the information available, that it is important to make your first move.I'm recently medically retired, but still actually pretty young and am looking to get involved in RE investing. 

As an investor - those are not your prospects - they cannot "buy" what you are selling.There are 3 MOTIVATORS leading someone to sell to an investor at a discount:1) SPEED - they are in a hurry, cannot wait to sell via retail, because they need...2) CASH - for some reason, perhaps medical, business related, who knows, plus3) DISTRESSED PROPERTY - they either don't want to make the repairs or simply have no money to make them, so their house is unlikely to pass an FHA inspection, so people cannot buy it with an FHA or conventional home loan (hence, the need to sell to a cash buyer).As an investor, you want to reach out to people with the message that you can deliver FAST CASH and there is NO NEED TO MAKE REPAIRS, you buy "as-is".  

I was looking to expand my knowledge in the medical field, but for that it requires being more in debt in student loans, and taking time away from full-time.

Main Team members are Attornies, Real Estate Agents, CPA's ( or accountants), Inspectors, General Contracters, and Handymen.I am 59 years old and I still have not decided what to do while I recover medically.  

The husband warned us that his credit is not great because of past medical bills.

I am working a fulltime job at Norwood medical as a machinist.      

I think there are 3 main reasons:Financial ignorance: most people I know are happy to follow the 401k path to wherever it leads and worry more about where they are going to go on vacation that year2) Laziness: RE investing is not something that can be done well while sitting in front of your computer and just clicking where someone else told you until you think you're smart enough to click where you want3) there is rarely a "fat pill" in RE investing.

Most of the people there were looking for the magic pill to make them rich without putting in the work.

I recently was approached to join a group of investors to purchase a medical building that is 100% occupied.

You can eventually trade money for time instead of trading time for money.My job was in the medical field where working all holidays were normal and I'd be lucky to get coverage for a week if I wanted to use PTO.