The comic I'm working on right now doesn't have definitive end, it's all about practice, practice, practice. That's the reason my current comic is just written chapter by chapter (I focus on character interaction, if they interact properly based on where their feelings are, then it's still a consistent story).
I am actually in the planning process of a more complicated comic with a friend of mine,and we are gonna be co writers/artists. So I'll just focus on whatever new story comes along. I don't plan on stopping making comics until I have to, for whatever reason. (Like...like I died, or something. haha.)