Want to contribute (PLT-2112)

Hi, I am new here and I want to contribute. I read the Code Contribution Guidelines and checked your Good First Contribution tickets.

I created an account for Jira and the project is building and running on my machine

I picked PLT-2112 as my first ticket to get my feet wet:

Allow Access-Control-Allow-Origin to be set from config.json

Questions

1. Do I simply add a comment in the Jira Ticket that I want to work on this?
2. Who can help me get started with the correct entry points?
3. I actually prefer go over js and most tickets that are good as first contribution are tickets related to the web client. Once I get more into the project, where can I find easy go tickets to start with?

Thanks for your help!