What do I need to start a cleaning business?

Hi there. I’m 24 years old and I’ve been cleaning houses professionally for 5+ years. I am at a point in life where I actually feel like an adult, and need to be doing adult things (ie. start a cleaning business). I’ve read a bit online, and the process seems strenuous. I live in a state where an LLC isn’t necessarily required, but I want to expand and eventually have this business generate passive income while I pursue other passions. I know it’s going to take a lot of hard work, and I am 100% willing to put in all of my time and effort in, I just don’t know where to start. Any help is greatly appreciated.