A good tip is to reach out to contractors, visit local supply stores, and check out online resources for cost ranges.

check the local municipal code, most are online.

I don't care what anyone online says if you live there and have tenants at your home it will be a job. 

Is the information about “In MA, tenants generally have 30 days to pay repair costs...” available somewhere online? 

You can find different strategies on how to find and reach these folks, such as driving for dollars, targeting mailing lists, networking with Realtors and other wholesalers, and having an online presence, plus paid social media ads, etc.

I remember the few experienced people I was able to speak with back in the day before online forums.

Check out the free content online of Bill Faeth. 

Paying for an online course before you know other investors and have gone to meetups is just paying to procrastinate.

From my experience, to succeed in multifamily investing, focus on networking through local meetups, online forums, and professional connections, leveraging your CPA skills to analyze deals and optimize deductions.

I wouldn't say you're going to learn as much going through an online course as you would an in-person one, but it is a lot more convenient.