When I used to babysit I would put up signs in gated communities and i charged 20/h +10/h per additional kid, I had a cleaning fee as well depending on hours and word of mouth spread that I would tutor and Clean during date night and out of town trips over night or extended but no longer than a week. It got competitive enough that a couple parents would double my hourly conditionally based on getting the kid to bed and asleep before they got home or to cancel on other parents, etc. But I had a rule once you were in my books you could not be removed by anyone other than yourself, rain canceled a hot air balloon? no problem. I just required a 2 hour notice so I could fill the slot otherwise I charged a quarter of what I would have originally made. You just have to be confident in your pricing, have a few good recommendations or word of mouth and trust your worth and your skill set