The page on which your article is published will be a PR n/a at first. That means that you will not get any link juice from ezine articles to start with.
However, eZine articles are useful in the following ways:
1) Google loves eZine, and has clearly tailored its algorithm to favour ezine articles pages even if they are brand new. If you get your keywords right, you could jump in at page 1. However, your article will still be PR n/a and no good at pumping up the PR of other sites with links. For this reason, eZine is best used for directing targetted traffic to your money site. It is highly effective in this regard.
2) As time goes by, you can add links to your ezine article, inflating its page rank and giving it a SERP boost. When your article begins to show a page rank of 3 or higher, it will be useful for inflating the PR of other sites.