One big thing with Joomla is getting a template that you like and will function for you and or your client. Below is a list of joomla free templates. Most of these people will also give you a professional tempalte for the asking and some dough of course. If you want a go and building your own tempalte, I would suggest the template tutorial on the Joomla site. It's usallly nested in the left navigation as a link all on its own.

• This is just a list of place to get FREE Joomla templates. If you like your tempalte, please donate to these sites or maybe even buy one of their commercial templates. Your support is always appreciated.
• joomla-templates.com
• joomlashack.com
• siteground.com
• mambohut.com
• joomladesigns.co.uk
• joomlart.com
• templates.joomlaya.com - a framed preview of all tempaltes, takes a while to go through, but it has a ton.
  and
  joomlaya.com