2. Start a friend's publicity. Your friends have friends, friends of friends have friends, and someone will learn to draw. If you don't get rich, you will definitely come back for you.
3. Find a painting lecturer to give lectures to parents. It must be free! Distribute publicity, such as newspapers (leaflets) and stickers. Brainwash the parents of students and let them take the initiative to take their children to learn painting.
As for the rent, to be honest, it really depends on luck. If you are lucky, you will meet a good price. It depends on human efforts. My friend once found a place to start a business for three months.