The property has been reported on the deceased's personal tax return. 

I'd always recommend flying out to where you plan to invest to get a feel for the market and to meet your team in person.

Never had to do this ever before  There are two ways to do this, google and find a template online or get a realtor that can use some promulgated documents by TR.Per law, no-one can write you a legal document except for an attorney or the person providing the document will be infringing the law.In terms of the tenant leaving there is no point to pursue any legal way and for you to get possession, you create a termination notice and then in 30 days you can take possession.

Keep your personal safety and that of your tenants and neighbors in mind. 

Maybe take a KPI online test, it will show the personality traits that are success indicators.

It is a very high cost of living and my landlord has been renting out the triplex for a little below market value for the past few years, however he is going to be selling the property ( all three units)  (This area is considered very nice and "shouldn't" depreciate in value. )I have been trying to deep dive into bigger pockets, reading bigger pocket books, watching videos but  a lot of the resources talk about multi-family properties as purely renting out all units and not actually living in one of the units. 

The mortgage is likely also personally guaranteed by current owners.

Some takeaways from him:Treasury Regulations section 1.280A-2(i)(3) gives a couple of ways you can proportion the rental portion of a property--my accountant used square footage.Under section 280A of the tax code, common areas that you also use are considered part of your personal space and unfortunately aren’t counted as part of the rental space in the proportion calculation.

I've done tons of reading and watching videos on Youtube that give very in depth information so I do feel comfortable tackling this deal, but would love some advice as I go through the steps or just someone to come back to for next steps mentorship. 

If the land is separate from the mobile homes, you may be able to see what the county assesses the homes if personal property.