There are a lot of great sales pitches out there that will offer you a "once in a lifetime opportunity" - lets be real, if this was such a great opportunity why would they need your money...

Her father is on board with the sale and even generously offered to give us a portion of whatever the net sale is.

(For example, I am in the 24% tax bracket, so I will really only be earning 76% of what I earn from the tenet.)Is there a resource online that has all the tax write-offs as a landlord?

We also would have to initially live off of some of the proceeds from the house after the sale.Our Amazon business is in online arbitrage, part of which is a not-profitable lead list business.

Back to finance question, would it be a better decision to take the funds from the sale of the 2 acre lot and pay off the current mortgage (~$150k) and live in the current home for a year or so (in hopes that interest rates will go down) then refinance that take out $400k from equity (~$750k) to build new house? 

What do you plan to do with the proceeds from the sale if you were to sell? 

I was sold the product by the sales rep that it was full functional accounting system but it's not.

Due on sale clauseI would like to hear people's opinions on this strategy if the risk/reward is worth it or to steer away

If you haven't heard of WIIRE (women invest in real estate), it's a mostly-online community created by @ameliajorei and @grace.investing (instagram handles).

Personally I would not look favorably upon a property management company with great online reviews.