Aside from the main story concepts and plotting, the other aspect of a comic/webcomic project is of course the art.
I am approaching this in a few stages.
Firstly I am designing a base "character" that both works for my artistic skills and style, and allows for an expressive design, I am almost settled on that step, which allows us to move on.
Secondly I am working on working within that style to design the characters that will be the leads and recurring presences for the story. This is a much more involved part of the process and is going to take a bit more time to work on.