Welcome to the ArtRage forums!
As Robert said, the use of layers is a matter of choice. Many probably approach them very differently. Do play around with them so you get a feel of how to move their positioning, that is, so you get used to which one sits in front of the rest, etc., so you can draw freely without painting over something else.
With regard to inking: I copied this down from another thread some time ago. I never used it, so I canīt vouch for how well it works, but I dug it out to share with you.
Using the felt pen, use the following settings:
--art pen ON
--select color black
At any rate, have fun here and with the program!
The only problem with humor is that no one takes it seriously.