How can I use plutus-PAB?

Hi! Talent GUYs!
I am beginner in Cardano blockchain.
To learn to develop Dapp on cardano I had already run the following smart contract on testnet.

Now I want to integration with PAB server.
I had already read some docs about PAB, but I am not clear yet.
If you have some experience with PAB, please guide me more correctly.
or I will thanks to specify the guidance to use PAB.