Download Python3+ which comes with pip and venv.
What venv does is create a virtual environment where packages can be installed that do not effect the global packages. This is done because if you have an application that works only on a lower version it will not be effected.
Create a project folder and cd into it.
Create a virtual env by running python -m venv venv
From inside your project folder run venv\Scripts\activate to start the virtual environment. This has to be done from cmd prompt.
Folder structure
project/
venv/
app/
init.py
routes.py
projectname.py