After installing the game and creating a character in BlockStarPlanet, you will be able to enter the magical world. Immediately after entering the game you will be welcomed by Dex McFly. Come to him to check your first missions.
These missions are mainly focused on speaking with NPC characters. As soon as the mission is completed, you will receive a notification in the upper right corner of the screen and will be able to pick up your prize.
Remember that you don't have to return to any quest. It is enough that you mark it in the quest tab. From there you can manage missions, collect rewards, and check additional information.
Mission rewards include coins, experience points, and various items. By completing missions, you can make progress in the game.