1. Find a real estate team that specializes in investment properties. Most realtors are just trying to get you in your "dream" house and could care less about the numbers.
2. Start creating your team. Real estate agent, lawyer, accountant and insurance agent.
3. Have your real estate team put you on a MLS email delivered search that takes your scope of interest and notifies you of everything that comes on the market.
4. Start looking at every multi you can, learn your market so you understand the baseline and you know a deal when you see one.
5. Evaluate each property as if every unit is going to be rented, and then understand that your cash flow will take a hit if you use it as your primary residence but that's ok and you will know that once you move out you will have a positive cash flow property.
6. Start making offers at values that make sense for you. You make your money on the way in, so don't overpay for a house or you will most likely never see cash flow. Find a distressed buyer that will bite at a low offer and try to get a deal.
7. Use bigger pockets calculators and rules on analyzing these properties and aim for 100-200 per door. 1000 dollars of true cash flow per month is unrealistic on a house hacked 4 family, at least in my market.
8. Good luck now get to work.