Hi,
The Auctiva folks can provide Custom Template services for a fee.
http://www.auctiva.com/designservices/designServices.aspxThere are "coders" often advertising their services on eBay's Classified Ads, but they may or may not be fully aware of Auctiva's methodology.
The Template builder has alot of basic editor features for the beginner. Searching html and css at google can provide tons of reference sites. Basic HTML reference books at a bookstore sometimes have editors and tutorials bundled. Got one of those for a friend years ago, that got her started. Don't recall the Title offhand, but a search at Amazon might give some good results.
A separate full HTML editor can also help with DIY. Search "free html editor" on Google. CoffeeCup is a good basic one, and their paid version is full HTML and CSS coding support.
Danno