Credit, budget, research?  

Current financial statements and of proposed transferee and its principals, along with credit reports, real estate experience and background for each 3.

My questions would be is it possible to find lenders given my low credit score?

Most owners are never doing as good as most think they do by owning one.Maybe if you can find distressed owners, and buy them 40-60% below market value, then improve things for a fast flip, you could have something. 

two questions...1st is I do a general improvement to a building as I read the tax code the improvement should be amortized over 28.5 years .However we did an improvement to just one unit with excepted life of 10 years.

Many folks on bigger pockets speak towards buying land+improvements, buildings such a multi-family, where they are buying land + improvements.  

I currently live in New Hampshire, and have one cash-flow positive duplex- which I scrimped and saved years for while building credit.

If the systems are in place to weed out the bad applicants, IE the ones with evictions, transient history, poor credit, poor job history, etc, then you shouldn't blame the PM when a tenant goes bad.

I have money saved up and also have a line of credit I could use for the initial purchase and rehab. 

@Corey Cetto contact as many local credit unions as you can.