Openvidu development

just starting out. i have both production and development up and running on a xenial server. I have looked through the various tutorials and did some git pulls, now am ready to try and create something but I am not sure where to start.
mainly, how do I get the development environment to use my custom html/javascript pages & files rather than the default ones? I would like to try and run some of the tutorials on my own server and then try some modifications after that.
i am invoking the development server as:
docker run -d -p 4443:4443 -e OPENVIDU_SECRET=MY_SECRET openvidu/openvidu-server-kms

Just follow the instructions to execute some tutorial and start changing the code to meet your needs.