House upgrade - Rent out old house

[Auston Foster]

I am 25 and make 100k a year. Looking to buy a bigger house and keep my current as a rental to start building a portfolio. I have about 60K in equity, minimal cash on hand, 3.5% intrest on the current house, and live in Tulsa OK area. What should I plan for to get started? Any suggestions on lending? Do I need to wait another year and save $10,000 cash in hand. Not sure where to even start.