Look at Python 3.9/3.8 and pip installation under Windows
Most of your question should be answered there.
I like to have simple Path to Python(Shown how to in link),so this is what it look for me.
Most of your question should be answered there.
pip
automatically install,you may need to fix Environment Variables Path
as shown link over.I like to have simple Path to Python(Shown how to in link),so this is what it look for me.
C:\>python -V Python 3.9.1 C:\>pip -V pip 21.1 from c:\python39\lib\site-packages\pip (python 3.9) # Show root path C:\>python -c "import sys; print(sys.executable)" C:\python39\python.exe C:\>