They have 'peel/stick' glue on back--should be sufficient if installed on a new, clean underlayment. 

My overarching objective is to accumulate sufficient capital, with the ultimate aim of engaging in buy-and-hold strategies.

It it NOT sufficient to mail this notice.

As @John Warren mentioned just have a local realtor or attorney give you a lease template that you can use, that is more than sufficient. 

Network to find a CPA who is good with Real estate investments and a Real estate Agent( considering my inexperience,untill I gain sufficient knowledge and confidence).Im still paranoid about investing into c+ class hoods due to Tenant screening ,which I have no knowledge of.

That's why having sufficient insurance for auto policies, rental properties, and primary residence are important. 

Having sufficient to capital to purchase (and reserve for repairs, vacancies, etc) is key. 

This may be as simple as ensuring hallways and doorways are wide enough (usually a 32" is sufficient), wheelchair ramps 12" for every 1" of rise; example 6" stair rise=6' ramp), and safe accessible bathrooms (walk in showers are best but not usually required). 

Ensure that the rental income is sufficient to cover these expenses and provide a positive cash flow.Future Equity Growth: Although you mentioned that pulling out equity in the next 3 years may not be feasible, consider the potential for equity growth in the long term.

While I’m not looking at doing so, I absolutely don’t want them stuck without heat, so I’ve purchased them 4 good space heaters which should sufficiently warm the home until my HVAC guy can get the install done.My tenants are wanting the problem remedied as soon as possible, but the replacement may not be done for a week and a half or two weeks.