Well, it looks like you got the advice you were looking for, but just in case someone else looks in here or if my own advice might help you in the months to come, I'm going to throw in my two cents.
First off, I strongly believe that no one should ever, for any reason, be discouraged from doing a web comic, ever. There's no good reason for it. There is, however, a bit of etiquette involved in sharing it. Once you decide you're creating a work of art instead of just a personal experiment, you may start culling out the "bad" comics, or start over, but don't get hung up on that first thing, or you'll probably never get anywhere.
I've seen too many fantastic artists and writers stall on perfectionism. It is your enemy! The whole point of webcomics is that they are an extremely forgiving medium. Just get started.
If you don't have webspace yet, start by just doing comics in your sketchbooks.
It's good to have a bit of a plan, or a set of guidelines or standards you can work towards, though.
Start by doing whatever comes to your mind. Shoot for what is most entertaining and thrilling for you to produce. Go for the high!
And keep in mind that you can always improve your comic in later strips. Shoot for the goal, but don't look back. Keep producing! Your main goal is to figure out how much you can produce a week at a given quality of work, and how to fit that into your daily life!
Your second goal is to learn how to produce a good comic. That comes with time and practice, and if you don't get started how will you practice?
Finally, read a lot of Scott McCloud and Will Eisner.
Give yourself a whole year before you start pimping your comic widely. Think of it as a fun hobby you can show off to your friends and family until then. That way, you give yourself time to learn how to keep it going and how to get over the bumps and hard times, and how to push yourself artistically. After a year, you should have enough work to show off the best stuff.
And welcome aboard!
