To create a Tournament character if you're logged onto the Tibia client you can click on the action button 
"Open Tournament dialog" and click on Characters and then click on Create new Tournament character and it will redirect you to the Tibia.com you need to logon and it will take you to the page where you can create your Tournament character. (You can log on to your account on Tibia.com alternatively, if you're not on the client. Once you're logged on you can scroll down to where it says Tournament Characters and click on create a character.)
You'll now reach the page where you can name your Tournament character, choose the type of store access (all store products or only store products that do not improve a character's gameplay (cosmetics), and then the game world location (Europe, North America, or South America). Please see picture below for what the page looks like:
A tournament doesn't have to be active for you to create a character and it doesn't assign a world for you based on your region, you can pick your own region. However, if you accidentally created a character in the wrong world location you have to wait until the sign-up phase is active. I wanted to paste a helpful FAQ on Tibia's website:
Q: I created my character on the wrong Tournament game world? Can I still change it?
A: "Yes, as long as the sign-up phase is active, you can still change the game world location, your vocation and the starting city on your ticket. To do so, click on "Configure" in the Tournament interface ingame and select a different game world."
Source: https://www.tibia.com/support/?subtopic=gethelp&entryid=187
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