Anyone can create a game and make characters, but ultimately it will be up to the GM of a game whether they will allow players to import their own characters. Some GM's may have a "zero" session used for character creation, backstory, question/answer, etc. Other's may have pre-generated characters that you can pick from. I would go ahead and create your own game and make some characters to learn the sheet. If a GM allows it, you can use the character vault to back up your character and import into their game.