I know that some common terms are: 2-4 points, with an 8-15% interest rate, over the course of 3-12 months depending on extensions and such.

I understand what it is and how to calculate it, but it just seems like the number could very easily be distorted depending on what percentages you're taking out for vacancy, repairs and maintenance, etc.

It depends on the comps, time to rehab, and the risk.I rehabbed a 3-plex by myself once.  

All depends on the zoning and land use.

It depends on how it was run, there could be 3/4" - 1"  hot and cold water lines run up and everything just branches off of that to each unit, then you would not be able to easily separate and meter them. you are going to have to look in the basement and see if there are separate main lines to each unit.

The market has improved considerably in Corpus and my house is now worth anywhere around $160,000 and up depending how updated it is.We want to sell the house and take the proceeds to invest in other real estate.  

Time to create depends on what you want, but normally it'll be 5-10 hours.

Depending on the zoning of your property, the configuration of your lot and the construction of the garage, you may not be able to get a CO from your city for the extra unit.Your best bet may be to make use of the space yourself, provided that your tenants still have proper parking.

Depending on what your needs are, it may suffice.

It all depends on you and only you!