A lot of this, 3 & 4 especially, is geographic-dependent. 

It's a range and depends on the property type, location, end condition and rental strategy. 

The increased cash flow would make such a substantial difference in your daily life that not paying it off would be foolish.Outside of that, I can't see many reasons I would take a 15% tax hit to save 4% on a mortgage, which is really only effectively about 3-3.5% depending on your tax bracket.

It is more dependent on that than your experience.

FHA will depending on how everything is setup.

In mid February, many tenants get caught up when they start getting their income tax refunds (depending how fast they file).Income tax refunds also give tenants the needed funds for first month of rent + security deposit, so they can move.Check out this graph, which was created from tens of thousands of data points:Regarding your property, suggest the following:1) Where specifically is it being advertised?

@Alicia Howard Since your 5th wheel RV is used exclusively as a short-term rental property and does not move, its depreciation depends on its classification.

Yes, depends on if he already has a loan and the rate on that. 

This depends on your insurance.

It depends on the rental income, what you plan on putting down (20-25% is typical, 15% or 25% is required for conventional depending on # of units) For your owner occupied deal, you should be able to use a portion of the rental income to qualify and help offset your DTI a bit.