This is a very important window it allows you to see the different programs you can open and can choose which windows are.
New composition instead of new document. could open more than one comp at an time. choose size, resolutoin etc just like photoshop.
NTSC american. Pal is the English option. the main difference is the fames per second. 24 frames is the traditional frames for film.
Even when you have made your composition it is editable and you can change the setting in the composition menu.
Similar to photoshop there is a layers menu.
You can zoom in on the time line by moving the orange bars on the right hand side.
The red bar controls how long the object will be in the video.
You can change all the yellow values and it will edit the selected layer.