Start with BiggerPockets Ultimate Beginners Guide (free).

Learn about the Net Operating Income (NOI) and Capitalization Rate (Cap Rate)—these are essential to analyzing the potential profitability of a property.Return on Investment (ROI): There are different ways to calculate ROI in real estate, such as looking at your total return after a sale or assessing your rental income versus initial investment.

Depending on the loan amount for the new property, roughly a little over half of the gain could be deferred through the exchange.Without a 1031, they’ll face taxes on the entire gain, including federal capital gains tax (likely 15% based on their income), California state tax, and depreciation recapture, potentially totaling $130-150K.

Start with BiggerPockets Ultimate Beginners Guide (free).

I have totally given up on Quickbooks though it remains the best accounting software for the non CPA type 

As Bill mentioned, the best way to decide would be to get a free cost/benefit analysis to help you determine if you would benefit.

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If the Ensuing damage is also not covered, the total loss could be vastly higher.  

I thought the regular "free" Stessa account was ok.

Interest income is interest income, unless you decided to roll some of the current cash into a self directed IRA at which point your interest income would be deferred for a later time and allow your funds to grow tax free.