He says he will teach me everything I need to know and that I can utilize his software and system and that he will split any business I bring in 75/25 (I get 75). 

I am seeking advice for the best rental property software.

This type of funding is my all time favorite, to the point I designed a Software system around the planning and use of it for myself, so I couold plan it out, and monitor it as I went through the process...and it was a lot of fun too. 

Also open to other accounting software suggestions.

I developed my own software to track the status of the deals, send messages, and pay with Paypal from the user interface.

I've been on Zillow and a software I have to get that data.

I am using this HR Block tax software and it only has option for a sale transaction (that would include profit/loss, past depreciation, etc. that kind of headache).

Everything i see people talk about is PC only, with sometimes a light version for mac.

Their is software you can purchase called  Real Estate Property Pro that pulls all the cash buyers in any state that have recently closed on a purchase. 

I am a software developer and very new to real estate investing.