Hi @Prashanth , good day. When you mean your license, you mean your own tenant? If so, you can go to #deploy menu and download the OneAgent from there, and it will be ready for your tenant!
Install the Dynatrace agent is very easy, once you have your Dynatrace environment:
1) go to the bottom left menu and select "Deploy Dynatrace" then "Start installation"
2) Select the OS where the agent will be installed
3) Follow the steps (create a token and copy and paste the commands on the host that you want to monitor)
You should have access also to the university to see some videos about getting started with Dynatrace https://university.dynatrace.com/