I am currently in the market to purchase a tri-plex with the plan to live in one unit, make upgrades, and rent the other two out.

Being that the LLC is two member it defaults to a partnership.

There are two reasons this is a bad idea.Investing with an SDIRA (assuming it is not a Roth) will often result in paying significantly more taxes. 

Maybe it's in my head but sometimes there are two LVP advertised online with the same thickness, but in real life one feels obviously thinner/thicker.

Include a buyout clause allowing you to transition to sole ownership after two years, based on a pre-determined valuation formula or market value.Use an LLC to hold the property for liability protection and pass-through taxation, ensuring both partners benefit from depreciation to offset rental income.

You might find it useful to attend a meetup or two just to learn how other folks got their start into the industry :) I host a small/intimate meetup once a month in LIC, check it out here: https://www.biggerpockets.com/forums/521/topics/1214850-meet...

You'll also need to show stable income for the past two years through W-2s or tax returns.Talk to 3-5 lenders to compare their rates, fees, and terms.

I have been fortunate to meet two of those individuals and gained a mentor.

I have two options 6.625% 30 year or 6.15% 15 yearI want to invest aggressively in the near future on more propertiesThe loan is only $110k and the monthly payment for 15 year is $563 and $750I will earn 2-3k a month in gross rental revenueThe property is in a declining population areaRecently rennovated, and all major things were relatively recently improved such as plumbing, the roof, a/c, electric, etc.Will require a lot of management as it is rent by the room so I may switch to a normal rental after 10 yearsI'm trying to find what will mathematically net me the most money in the long run.

Property manager and assistant property manager (as your direct contact)cheap, fast, and good - typically you can only pick two