List of things to fix:Clean house, Carpet replacement, Floor patch up, Interior Painting, Bathtub recaulk, water heater replacement, leak check, small dry wall cut and restore, Roof fascia repairThank you.

I don't plan to do anything too major on my first one (like adding bedrooms or moving walls), but it would be nice to be able to update a kitchen or bathroom.

I will bet I can send you some great deal, but you won't have the ability to know they are deals because you don't have the experience to do the math.The biggest problem both new and experienced investors have is nobody watches our backs because everyone has their own agenda and the greed more money.What you need is to do is; rather than banging your head against a concrete wall, post the properties you are looking at, write as much detail about each property as you can including rehab costs, rental income, how much you can increase rents and then let people give you their opinions and advice.Here is a serious problem with people who own their own business and then we wonder why some people are successful and why some are not. 

We found he had hidden undone plumbing in the walls- he just put the drywall right over it thinking we would never see it. 

Usually you can add additional support and fix this problem but I did run into one house where there was a single center support running through the middle of the house that was entirely rotted and the only way to get a new support of the appropriate length in would have been to take out a portion of the basement and first floor walls.

Subject property is in Phoenix, AZ and looks to be ideal for throwing in a wall and kitchen and making it a duplex, but I’m not sure how to go about zoning it.

This will help you steer clear of a lot of the mistakes people make when walls are opened up, mechanicals changed, kitchens redesigned, etc. 

There are other things you can negotiate like them building you a privacy screen wall and adding landscape.

Fully gutted the house, Opened up the wall between the kitchen and living room, New cabinets, new granite, new appliances, new windows.

In my area, decent tile setters are $20-25 per sf for wall tile, so your price seems about right, even a bit low, for a standard tub surround.