I've been looking into several grants but they insist that one must be enrolled in college full time (which I am not). 

Very knowledgeable and he's also an enrolled agent. 

You need to learn how to determine market value, how to advertise, how to pre-screen and screen, how to protect against predator tenants, how to deal with late rent or unauthorized tenants or pets, what you need to know about lead paint or mold or ice dams or furnaces or pet urine on the lawn...If everything goes right, you rent the place one day after advertising, a little old lady moves in, and she pays rent without fail for 30 years at market rates and you walk away a winner.The more likely scenario is that you'll enroll in the school of hard knocks and be beaten back and forth many times before getting it right, losing thousands or tens of thousands in the process. 

I’m new to BP, as a 22 year old I’m currently enrolled at my university I was wondering if I should start investing as fast as I could or finish my education then start investing.

While this works well in every town, I think where it would really excel is in those towns and cities where you have big universities and enrollment along with infrastructure continues to escalate. 

I realize this is costly, but I have the ability to enroll each and every unit if I want.

I don't think Wash U is having the same student enrollment and retention issues that a lot of other Universities are having. 

But it was in a high demand school district & they wanted to nail it so they could have an address for the school year enrollment. 

So I just switched from my old, used-to-be-a-CPA, to a new IRS Enrolled Tax Agent.

You need a tax CPA or Enrolled Agent (EA) to help you pull all this together.