How to start with SFH in tri state area, looking for advice

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Hi, I am a young teacher from the Bronx, and have come to realize that the Bronx, Yonkers, New Rochelle etc. have all become difficult areas for a beginner. I have decided I am willing to invest in a SFH far away from me, in different states like NJ, PA, CT.

I have around 30 grand in savings from this past year. Yesterday, a friend and I were debating how I should start. I am targeting my first SFH for around 100,000-150,000 dollars

Should I wait till I have the full amount in cash? 

(I expect to have up to 150k in three years time from savings and family loans)

Or, should I use the 30k as a down payment this year? 

(I would use this model to buy a SFH every year or so until I had enough equity to start investing in my area)

I am ambitious about starting. But am I being naive? Your experiences would be invaluable to me. Thanks