A Great Hobby is to Build Plastic Model Airplanes.
You start your model by building the interior and the cockpit. It’s a good idea to research pictures of the actual plane you are replicating, in order to achieve the desired detail of the plane. E.g. painting the correct colours and symbols, and also painting in details such as the control panel inside the cockpit.
Cut the parts loose using a knife, and try to refrain from breaking them off as they can be quite delicate.
Cut out the decals and apply them to your model using a small brush to help remove the excess water. Use a piece of tissue to help remove the water from the area around the decal. Brush a light coat of decal setting (solvent) solution while the decal is still wet. Do not use to much solvent, it may disintegrate the decal.
Try not to handle your model until it is dry otherwise it will be covered with fingerprints. Browse some great model airplanes here.