Do you mean when I decide to do a new comic project, or when I actually work on the pages?

It depends on the specific project. With BD, it's to draw a bunch of silly stuff going on, though if I'm not in an ideal mood when I'm actually drawing pages, the goal changes to "get 'er done! Bufferbufferbuffer!"
For Senka, the goal is a secret <3
The goals for my side projects tend to be more art-focused, such as practising some sort of action or enjoying some scenery.

In every case, I guess the goal is for me to have fun drawing or writing something I don't usually draw/write.