@Steve Vaughan I think one of the main things that distinguish really good agents from the bad ones....is how desperate the agent is for the money. 

I have a turnkeys 101 eBook, but it's more about distinguishing the different players in the turnkey space, the buying process, due diligence, etc.

However by educating oneself on the subject matter and obtaining mentorship than it can assist with avoiding major mistakes.

I hate to stereotype or 'draw lines' but it is often distinguished by crossing over a highway or major road, 'block by block' in other words. 

@Jared P.Quickbooks is an accounting/bookkeeping software that is used to track your data(income/expenses/assets/etc).If the property types are organized in a separate entity type, I would have them in two separate files.If they are not in a different entity type, you may want to use the "class" function within quickbooks to distinguish the asset classes.With that said, you may want to still operate them in two separate files if you find it that both businesses are too unique to another.

@Tony P.You should work with a realtor/agent who is familiar with real estate investments and one who focuses on being a buyer agent instead of a seller agent.This agent will be better suited to distinguish which property will make a better investment.

Any competent lender should be able to distinguish phantom losses due to accelerated depreciation etc, from actual losses. 

Since this is a common area, are the supplies tax deductibleIs there any general rule of thumb to easily distinguish between what is deductible and what is not?

Surrounding oneself with the best kind of people is probably the best "high level" decisions I ever made. 

that data point alone tells me nothing, because i don't know what the "Great" PM that distinguishes themselves from others are profiting. maybe the top 5% is making 20% profit or everyone is making 2% or less, i can't tell that from your comment.