I'm currently interested in getting started in buy & hold real estate investing to supplement my retirement in 5 years. 

I would supplement @Russ Seiler's endorsement with a word of caution and a recommendation that you review any "creative tactics" gleaned with a tax accountant and/or attorney before putting them into play.There are still a number of "Rent to Own" providers in Canada who are operating in a manner that is "grey" and out of step with CRA publishings.  

I know how to get them to double opt in but thought I would see if someone had a generic list.

A generic business perspective may not be applicable to your own personal situation.  

I am a Columbus based musician looking to supplement my inconsistent income with some cash flowing rental properties. 

As both an agent and investor in real estate, I can personally and professionally attest the significant role that investment properties can play in developing a portfolio of supplemental income.

But ultimately, I'd like to supplement my salary and escape the rat race.

You need to look at occupancy so a generic comparison of Poconos to Vermont not so much info. 

You can download a generic one off the internet.

Do you use a generic email or a company type email like your company name?