Building panels, and then programmatically updating the panels

My manager said I could build webpages using Pycharm (Professional).  he is using it to build our application in Python, and I have been given the responsibility of creating a user front-end that a user will log into and communicate with our software over the internet.  I have played with Pycharm and created a very simple UI that does really nothing.  I am looking for some basic guidance and where to go, so I can figure out what I need to do.  I looked for templates in Pycharm but couldn't find any.  We have only two basic screens that will present to a user.  I had our website developer create the first screen but they built it in WordPress and I don't know how to convert to work in Pycharm.  Where can I go to get THAT information?  I'm really overwhelmed here.  i have years of programming experience but not with this stuff.  thank you for any guidance.