Three parts, in this order
The window, the well, and the paperwork.
People skip the third one and meet it again at the inspection. Read them in order: each answers a question the next one assumes.
Install the window
What the code requires, the sequence of the work, and the point where you should stop and call someone.
Build the well
The code minimums, the drainage step that decides whether your basement stays dry, and the depth that owes a ladder.
Pull the permit
What the paperwork costs on a real published fee schedule, who files it, and the one number to ask your building department for.