A tiled stove can be a bit slow to start up. First, try to keep the door ajar when you light the fire. If things do not get better, you can also have a window or a door ajar at start-up. The reason why the stove is difficult to start is usually high underpressure in the home.
Many people install a DraftBooster (start-up fan) on the chimney if they encounter problems with underpressure. If you have a fresh air connection from the outside, make sure that the ventilation grille is not blocked or that the fresh air hose does not have any kinks.