From what I've read around, it's extremely hard to find artists for webcomics, because it's really time consuming, and there is no money to be made in the short-mid term. Maybe if you already have a very good friend who also happens to know how to draw, otherwise I wouldn't count on it. You're better off drawing yourself.
Lots of webcomics start with very basic art style and evolve over the years. Gunnerkrigg Court immediately springs to mind as an extreme example, but things like Questionable Content or Order of the Stick experienced very noticeable improvements too.