1. Once you complete the application you should get the option to pay the fee. It will tell you how much to pay. Just for TPS it should be less than 100 dollars.
2. If you want to continue working, you need to apply for EAD. The current one will expire after June 30, 2024. It’s better to file it together with TPS.

I would suggest you to create USCIS account and start the filing process. It is pretty much self-explanatory.