Have you considered house hacking that is living in one of the units and rent out the remaining units. If so, you may qualify for an FHA loan with about a 3% down payment requirement.
What is the plan for the first property? If you are going to keep it as a rental, the key is for that property to be cash flow positive. In essence, the property will be considered as additional income. The lender will most likely look for you to have a reserve fund (say three months of mortgage). They will also take about 80% of the revenue from the rental (the remaining 20% will be considered vacancy). I recommend calling the bank and/or a broker to see what other tips they could provide.