Best way to start out and grow

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I am a young soon to be investor. I will have little money to start (under 50,000) and was wondering what would be the best way to start and grow. If it was to buy multifamily and rent out, buy cheap forclosures or fixeruppers for 10 to 20k (yes available  in my area ) fix them up, rent them out and refinance to take the cash out and keep using that to gain more, or to do the same with multifamily. I am looking for rapid growth and numbers but primarily cash flow to keep investing. Any help would be great. Thanks.