Right, it's good to know you've got experience in webcomics, and that the artist won't have to deal with building the site at all, but you need to put more information in your pitch. What sort of art style are you looking for? Do you want colour or lineart? You might want to provide a short example of your script, since different artists work in different ways. Some prefer very detailed scripts while others prefer them to be more vague, which allows them more artistic freedom. Also an example of the kinds of jokes or a short story arc so potential artists can judge for themselves how funny your comic would be (that's not to say I don't think it will be, it's just that people are more likely to believe that "hilarity ensues" if they can see for themselves that you can write funny). What format do you want the comic in - four panel strip, full page, etc?
What can you offer the artist? - if it's nothing, then say so. Whatever you say, don't say "exposure" because that will put off the more experienced artists who don't need exposure, and you'll end up looking pretentious and it'll be harder to find a good artists.
And while I'm at it, actually, while generally your grammar is good and I can't see any spelling errors, the sentence "Hilarity of course, ensues" is missing a comma after hilarity. Now while I'm quite happy to accept that might have been a typo, others might not see it that way. If you're a writer looking for an artist, you've got to show you're a competent writer and as such you can't trip up on something like that.
Good luck finding an artist. I'm gonna go start a thread about writer-looking-for-artist-posting-etiquette.