This module lets you set a destination to redirect all users viewing your Drupal site with a mobile device. It is similar to the Simple Mobile Redirect Module except it forwards to equivalent pages in the mobile site. e.g. if the user lands on yoursite.com/store it will redirect to /store on your mobile site.
It's best to use this module in conjunction with a multi-site setup. You can then share all your pages from the main site but set a new theme and make any other changes you might need. A small amount of googling will provide you with the instructions on how to do this.
As always, let me know how you get on and feel free to put in support or feature requests.