I'll tell you the steps I took when getting into house hacking:
1. Read about and research the industry (BP Book on Rental Property Investing, Managing Rental Properties, Real Estate by the numbers, etc., youtube, and podcasts). Network with friends and professionals in the industry.
2. While you're reading and learning, start looking at listings in the market you are interested in (both for sale and for rent). This helps you learn the price range, quality, amenities, competition, etc. for the homes you are interested in purchasing and for the rental properties that will be your competition when you are renting out one of the units/bedrooms while house hacking.
3. Find a lender to get preapproved and find a real estate agent to work with to aquire the property.
4. Open a separate bank account for the property and manage the property like a business. I like to pay myself the expected rent of the unit I live in and also contribute any savings into the property account. Then when the account has appropriate reserves and enough to withdraw for another downpayment, move onto the next one!
If you want to do this multiple times, it is important to be mindful of what your DTI will be after purchasing the first property.