Fix + Configure Virtuemart for Joomla

Hi, I have a website (c a t n e y s dot c o m) set-up with Virtuemart installed. It needs to be configured to work properly and professionally. Proper fields need to be validated and the check-out process should be smooth without issues. MOST of the time, when a new user tries to register or check out as a guest, it goes straight to a "Select a shipment method" page (shipping is FREE so I do not understand why this occurs). And check-out cannot be completed. I need a virtuemart expert with good common sense and knowledge about the check-out process. Thank-you, Anna