Friendly Urls and Folder Structure

Question

I am developing a system for ordinary users (these do not need to log) and users with permissions (registered in the database).

Let’s assume that the system is for registering phone numbers and that ordinary users use this site to make queries in numbers, how it would work:

Common user accesses listatelefone.com (index.php) choose your city and the system redirects that user to cidade.php through the ID of the chosen city.

Looking to offer user friendly URL, the idea would be:

www.listatelefone.com/ (index.php)
www.listatelefone.com/Nomedacidade (aqui seria o arquivo cidade.php)

As for the restricted part, assuming that the user with permission has a "restricted" home page and pages to register phones with upload image files, what would be a good way to organize this in the URL and folder directory so that the result would be www.listatelefone.com/restrito/ on this home page and consequently www.listatelefone.com/restrito/cadastro?

For this I could create a folder .../restrita/ and add the file cadastro.php in there? or there are different and more interesting ways of doing it?

Forgetting just the Urls and going to the organization part of uploads and processing files (valida_form.php for example) I thought about creating an Upload folder, where for example, inside that folder, you would have .../imgs/cadastro/ (this page would include the registration images) while to save processing files, it would be in some folder like .../processos/.

And finally, the archives .css, .js, among others - these I thought to put each one in its respective folder, for example:

.../css/arquivos.css
.../js/arquivos.js

• How do I get friendly Urls and follow the structure I mentioned?