To start writing tg fantasy fiction, you need to be well - read in the genre first. Read a variety of fantasy books to understand different styles, tropes, and themes. Next, come up with a central idea or concept. It could be a special type of magic, a prophecy, or a unique item. After that, outline your story. Decide on the beginning, middle, and end, and how your characters will progress through the plot. Also, don't be afraid to be creative and break some rules.
First, create a unique world. Think about the geography, the races that inhabit it, and the magic system if there is one. For example, J.R.R. Tolkien created Middle - earth with its own languages, cultures, and landscapes for 'The Lord of the Rings'. Then, develop interesting characters. They should have their own goals, flaws, and backstories. You can start with a simple concept and expand from there.