So, this one is easy to answer. Seotoaster has a very -- Very -- powerful and simple mobile plugin that allows you to create mobile themes VERY easily. You can find a good example of what kind of mobile site you can build by browsing this site from your phone or tablet:
http://website-template.seotoaster.com/
Once installed, the plugin allows you to chose what page will appear in your website's mobile version, and what will not show.
Making a mobile theme is a breeze, very similar to creating templates for the toaster. Here is the mobile plugin page:
http://www.seotoaster.com/mobile-website-design-development.html