Choosing the most expensive insulation because it's the most energy efficient, should allow you to reduce and/or eliminate costs in other areas.4 - Energy efficiency isn't made up of added costs.5 - Energy efficiency is the product of reducing energy needs, not supplying added energy.6 - Cost effectiveness is a product of maximum use of materials, as in little or no waste.All of the above should be obvious, in parts. 

The property was built in 2018 and the other unit with power had no major issues and all HVAC’s, water heaters, electrical, etc all work fine.

Added new plumbing, new electric, new windows.

If so, expect to pay an additional 200 a month or more for water, 300 for electric, and a LOT for gas over our long cold Michigan winters.

Applying those principle, focus your energy on doing the preventative things on a day to day basis that reduces the risk of claims from occurring in the first place  (siginign vendor agreeements /collecting insurance certificates) and carry appropriate levels of insurance.

Make sure that you have an inspection period of a couple of weeks to get contractors, inspectors for roof, foundations, electrical, plumbing, etc to make sure it is not needing too many repairs.From what you have said, it sounds pretty good.

Basically, i think all i need to close the door the Bedroom to the kitchen area, add an exterior door, add kitchenette, and possibly add its own electric panel.

North of town, west of I-5: 95219 Brookside (high end gated communities; Mello Roos school taxes - so high taxes; Lincoln School District; some peat dirt problems on streets; don't know about foundations); Spanos Park West (some gated; lots of huge houses; basically built for commuters just west of I-5; Lodi School District) North of town, east of I-5: 95209 Spanos Park East, Colonial Heights (most Lodi Unified Schools; though small pocket of Lincoln Unified) North of town, east of I-5: 95207 Parkwoods and Lincoln Village (Lincoln Unified Schools; was considered best family area due to Lincoln Schools, but lots of flat tops and built since the 1950s so electrical can be kind of minimal - 1 outlet in kitchen instead of enough to use multiple appliances); lot of remodeling in this area.

One guy did the labor aside from the hvac and electrical.

If you want to self-manage, then you should have the time, energy, and competence to make your own investments.