Where this is an over/under duplex the ceiling / floor assembly between the two units will need to be fire rated - here that translates into voids filled with fire-rated insulation such as Roxul Safe-n-Sound, resilient channel across the joists and 5/8" fire rated drywall (or the 1/2" dense core fire rated which is super expensive).  

Whatever it is, you'll need to have some idea of your investment strategy in order to effectively talk with agents and lenders on your team (step 2).2) Assemble your team (agent, lender, property managers, etc.)Now that you have an idea of your buying criteria, you need to assemble your team.

One of the essential parts of business is having a team.I'm assembling a multifamily team of professionals in the Philadelphia area.

I have also noticed that the RTA (Ready To Assemble) Store has excellent pricing as well.  

I used to assemble land for commercial so I familiar with developers.1.

If so, that is exponentially more challenging than staying local and will require a great deal of dedicated time to mitigate the high risk: researching sub-markets and neighborhoods in your target area, visiting the area (probably more than once) before buying, interviewing PMs, assembling team in your target market, connecting with local investors (joining the local REAI is a good start), and building processes to monitor everything effectively from a long distance (which might require instructing your PM to customize the information they provide to you).You are really going to need a very trustworthy associate in your target market to make sure you don't get screwed over, especially on the rehab.

I have used bestonlinecabinets.com for multiple projects great real wood quality and fairly easy assembly and good support as well as direct shipping usually included for a full remodel. 

The Groves have created a big business on real estate education with a very efficient assembly line that keeps continuously dumping unexperienced investors to the marketplace that focus, pretty much exclusively on subject to deals.

Did he/she assemble land sale comparables to make a market-derived adjustment, or did the appraiser just throw a dart at a land adjustment on the Land Adjustment Dart Board?

I now use his power-team in Houston (free of charge and he gets no kick backs from me using them) and have started assembling some other individuals onto my own power-team.