Heya! I'm no expert, but I'll be glad to help!
So the first thing you might want to do is figure out what a good hourly rate is for you, i.e. minimum wage where you live or a good starting point like the cost of a premium membership per month here on TH. Then, when you have that ready, you can use this tool to price how long you've been working, so work on a sample and see what the result is! Don't underprice yourself! ; u;
I can show you how to work the cash clock if you need to. Hopefully, this helps you set a baseline at the very least for prices! Then, you can adjust your prices accordingly!