Why won't it connect to Active Directory?

Question

Active Directory

I set myself a goal: to raise an AD domain on the network and connect users there.
What has been done so far:
1. Installed win2008 r2 (hereinafter referred to as the AD server) and installed the AD role
2. Connected the AD server through a router to a regular PC.
3. From a PC I try to enter into the domain (I enter test.local) and I get "Could not connect to the AD controller for the test.local domain"
What I would like to know
1. Why this can be
2. Explanatory video where the bearded admin shows the entire setup from scratch and adding groups / rights / users and programs to the auto-installation, while commenting and explaining all this (yes, I searched on Google but did not find any sensible one).

Answer 1

my friend's ports. ports!!! you record a video how to open ports?)