Hi Denningga,
A few weeks ago I too startted with Joomla Mobile. I had the same situation.
In Joomla Mobile settings you find a drop-down box with several templates. Choose one. For instance I use the template mobile_iphone. After choosing, save the changed setting. This must work.
But if you are changing templates for the "standard site" (as I did) settings will change again. So stay out of there.
And a tip. It may be better that you will limit the items in your mainmenu. It will be unclear in the mobile version.
I hope this will help you a bid. Good luck.
Greetings,
Hendrik Jan