I work on the Central Coat of California but would be happy to help anyone regardless of location. 

The streets in 75% of the subdivision are not finnished with the top coat of pavement, and I have been told that they will not until the whole subdivision is at least 80% compleete.

 #3 will differ depending on your locale, latitude, etc, but here in the sunny dry southwest, its basically as follows:  Roof coatings, Mini-Split HVAC units, the best windows you can afford (or glass block has a VERY high R-Value) and if you really want to go big, PV/Solar system.  

Here's what I gleaned as a summary of hardening tips for reducing turnover/maintenance costs:panasonic bath fans with timers in bathrooms4 coats of poly on wood floorsdouble door stopstile floors, showers vs surroundssingle lever shower valve vs. doublereplace toilets with steel parts/mechanicals whenever it starts to runKwikset smart keys (some debate over efficacy)door stoppers on all hingesremove pop-up drains and replace with commercial drains2' drain lines from sinks with an accessible clean outbuy a key cutter - maker for $50 on craigslistGranite tile counters - need a diamond polisher and tile sawUsed Fixed vs. friction shower rodsKeyed deadbolt and passage knob on outside doors to prevent accidental lockout5/8' fire core drywall - can't put a fist thru it and its fire-resistant1/4" board to back up towel rodspolyurethane cabinets under sink to pre seal and drain water to the floor2x4 base under cabinets to prevent particle board cabinets from failing where they meet the floorVinyl scrap under sink and up the back wallBest of luck!

As of right now, I barely have any money, my credit is teetering on a 600, and I just recently got a good job as a server at Bubba Gump Shrimp Co. at Universal City Walk in Orlando, FL.

The only downside is that for the thicker vinyl plank (I don't use the really thin 2mm stuff) the prices are increasing because of it's popularity.I still generally use dark rental grade carpet in my bedrooms.

A fresh coat of paint, a good carpet cleaning, open blinds, and a glade plug in go a long way.

It requires no rehab, the major systems/roof should be all good for another couple years and then some and likely only needs some cosmetic touches to get it ready for a renter (coat of paint in some rooms, etc.)Note that the rental properties I am considering are all turnkey or are already cash flowing, so no significant (or zero) costs for make-ready on that front either.

Any and all advice is welcomed, I'm thicker skinned.

Any and all advice is welcomed, I'm thicker skinned.