How do i create a Titlemap?

I saw some wads that have that.
And for example like in Skulltag.
I just wanna known this so i can use it for my maps.

http://zdoom.org/wiki/TITLEMAP

Create a map (ideally in "(G)ZDoom:UDMF" format) and name it TITLEMAP. "TITLEMAP" should be the map's coded name, like instead of "MAP01", not necessarily its nice name, like the name "Entryway". The player doesn't accept any input in a TITLEMAP, so you might want to use some ACS scripting (for example ChangeCamera and use moving camera things) to create some meaningful cinematic.

I did that but its hard to understand how to do it.
Heres the map that has that

I don't understand your last post, as you didn't state what's wrong. Did you run into some particular problem that you want help with, or have some particular goal that you don't know how to achieve and want an advice, or was it just a demonstration of your work in progress that I was not supposed to be replying to?

Well if i add a aiming camera this happens
Aiming Camera o: cant find thing 0

Aiming camera needs some specific thing to aim at and to follow. Said thing should have a non-zero Tag, and the aiming camera should have set this Tag as its fourth argument. See here.

I want it to follow the Cyberdemon but it dosent work it uses the player camera,Not the Aiming

Give another Tag to the camera thing itself and write an ENTER script that uses ChangeCamera to make the point of view switch from the player to the camera thing.

The best examples of pwads exhibiting a TITLEMAP are
1. KNEE-DEEP IN ZDOOM



2. THE REFINERY

3. AUSTERITY - A SIMPLICITY TRIBUTE

just load them into GZDoom Builder and/or Slade3 and see how they were constructed.