Ashstone is a free-to-play game. Additional character slots and such can be purchased (nothing can be bought that alters the game balance or gives your characters any game-system advantage. These are just for the boost in coolness factor).
You'll need an account to make a character, and you need a character to play the game.
Once you sign up for an account, you'll be able to set up your character. You'll be able to choose your species, stats, and starting skills.
A tutorial is available for new players to teach you how to move through the game and interact with other peoples' characters and objects in the game.
Needed for new account signup:
name your account
email address
password
TOS agreement