So you want to write, and you want to write fantasy. You want to write good publishable fantasy! The below list of links will help you in getting started with this, from advice from fantasy authors who have been published, to advice on writing in general from those in the industry:

General

(Even before looking at the below, the best place to start, is by reading fantasy (see fantasy authors for a starting place to do just that, and then have a look at some of the below)

Getting Started in Fantasy Writing (a brief introduction including the importance of world building)

Allen and Unwin - The Writing Centre (contains advice on everything from getting started to getting published as well as a number of competitions available to enter)

How to Write a Best Selling Fantasy Novel (a tongue in cheek look at the formulaic nature of Fantasy and a good starting place on what not to do)

The Complete Guide to Writing Fantasy, eds. Tom Dullemond and Darin Park, a review of the book can be found at Fiction Factor.

Write a Novel

Write Science Fiction and Fantasy (a step by step guide to writing the genre of fantasy and science fiction)

Writing fantasy and science fiction, by, Lisa Tuttle, (2nd Edition, A & C Black, 2005), (reviewed at Writing Fantasy & Sf)

Fantasy Authors

(with detailed advice on getting started on their websites)

Fiona McIntosh

Terry Brooks

Sara Douglass

Robert Jordan (an excerpt of an interview)

Lawrence Watt-Evans

Ian Irvine