Need help taking advantage of opportunities.

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I have been thinking about real estate for a couple of years, but in the last year I have become very serious about it. There are quite a number of multi-unit homes in my area for sale. After a few months of research and a lot of footwork, I have found that a number of these properties have tenants that have been in residence for years.
After creating senarios using combinations of different properties, I believe that after aquiring 3 to 4 properties I will have a gross monthly income of 3500 to 4500.
However, I have a problem that is similar to that of many others. Low credit score and no money for any sort of down payment. My plan calls for an outlay of about 250,000. Can anyone suggest any means for me to obtain financing, and possibly point me in the right direction?