Active Directory Automation

If you always fill out identifying fields in AD like location, you can run a scrript to evaluate that and perform the necessary changes.

You always trigger that manually in one or the other way. But you cannot trigger something automatically if a user is created.
Your best choice is to use a script to create the user and perform all necessary operations, similar to what nappy_d showed.

Agreed with @Qlemo.

You would have some planning to do but based on the start I've sampled in my original post, it would be best if you had nested security, as well as role-based permissions, for your security groups.

This would assist with the script for creation of new users.

I can also show you how you can implement if statements for a feature command called if member.

Quest makes some great tools but this is not one that I've used.

It really depends on the complexity of the task that you want to automate. If it's a small environment, a PowerShell script can be perfectly ok, but if you have long provisioning procedures with lots of rules to follow, there are advanced tools that let you put it all together.