I have a mix of 15 and 30 year mortgages. my thought was to concentrate my fire on 5 mortgages for properties I know I want to keep, and maximize cash flow on the others - sort of like a debt snowball.

I do want to concentrate on a solid buy and hold strategy which will eventually lead to commercial purchases.

@Dave CarpenterMy business partner and I are looking to invest in the south Bay View area, concentrating on fixing and flipping single family homes at first and then moving into the income property market.I would be interested in hearing how you came to acquire your first duplex?

Stay focused on income productive things and eventually have a system that can replace you so you can concentrate on income productive things.  

I would concentrate on a smaller area and send postcards once a month to the same prospects, one mailing is not going to produce the results you may be expecting.

Flippers concentrate on off-market properties to get bargain basement prices to make flips worth their time and effort.

concentrate on paying minimum on 4 and aggressively on putting the maximum allowed on your budget for 1.  

My name is Randy Roberson and I'm new to the real estate world however I was a general contractor in the late 70's and I have purchased my own home...currently concentrating on wholesaling and needing to build a buyers list...this venture is part time at the moment but wanting to build a retirement 

@Ade AmudaAs Derek mentioned too, I'd concentrate first on determining ARV in order to get a solid number and offer to present.  

Good luck on your first flip, what area are you concentrating in?