How to fork, create branch and link with jupyter notebook?

Hi I am new to the github and jupyter. I want to do couple of task:
a) fork the respo of github.
b) create a branch.
c) create a new jupyter notebook.

a) I went to the desire respo and forked the respo that i needed and clone it using the git CLI. Next step I did was git remote add upstream the respo which I cloned. Now I have created the branch on the github. I can see the branch in the github, in the CLI I can see the branch as well. Now I want to create jupyter notebook that uses the function of respo i forked. Anyone please help me to link the jupyter notebook with the respo so that i can write me code.