Multis are great for cash flow, but you'll also deal with multiple HVACs and other major systems.

The best defense against IRS audits is a good record-keeping system.

We self manage in Phoenix so we have most of the systems in place to screen/lease/collect online. 

if it is, only reason to add sheetrock is to increase value (for refi) and attract better tenants. look at comps in the area and see how they are done2. minisplits can be purchased and installed for $800-900 each. a standard forced air system runs anywhere from $4,000-6000, depending on the size. without seeing the house, its hard to say which is better. 3. some things i do to "tenant proof" my rentals.

Nothing is worse than having to dig through a bunch of personal accounts to find the stuff you need to books financial statements together. 3) Use a real accounting system (Quickbooks counts, you're good here)4) Get trained on your accounting system (bonus points if you can get training from someone that you can outsource to later)5) Get even more cash flow - outsourcing usually starts around $200/mo and that's the really, really, really cheap stuff.

Radio is surprisingly one of the best options for fix and flip, buy with cash investors if you want to scale up, but if you open that door you have to have the systems and callers and responders to back it up.

Added an irrigation system to automate the yard.

In your opinion what team members and other systems are critical for running a smooth investment business from out of state?

His marketing systems have been tremendously helpful to me for growing my business. 

A good direct mail campaign also includes automated systems to receive phone calls when someone responds to your mail (in the event you're not available) & websites.