The Timeline module was created by Joan6694 and they have created many detailed tutorials for you. Make sure you follow them as they are awesome and without their skills, I would not be creating the animations I do using their HSPE, HSUS, Bone Collider and other mods. Get Detailed Timeline updates here
My basic tutorial - Part 1 of 2
If you do not like reading then my video tutorial might be enough to give you a basic understanding of how it works. The first tutorial will show how you can make the camera zoom in and out.
Watch Part 1 tutorial [no sound] - You will need to click pause between descriptions as they appear and disappear a bit too quickly. Sorry :-(
I forgot to explain some of the menu items.
The diagram below has done this :-)

Part 2 - Expanding boobs
The second part will show how you can target and animate specific bones inside the HSPE mod.
Important setting change!!
Avoid deleting your workspace items with this simple configuration change.
In Timeline you can press the DELETE key to delete a keyframe. This will also delete the highlighted item in your workspace area too and you are not able to reverse this. To force StudioNEO to ask for confirmation go to /plugins/HSUS and edit the config.xml file. Change this line so that keyEnabled is set to true and save it,
Good luck learning :-)