New to real estate. Answers please!

Hi everyone I just closed on my first property at 60k. I'm interested in obtaining at least 3-5 more properties by 2019. I've been trying to figure out how do people obtain 5, 10, 15 properties. I read a little about a real estate commission etc. What would be the best solution for my future properties? Finance then then rent them out? I want to make profit from renting them out. Any suggestions? Thanks!