To earn money, you need to explore the world and interact with the characters. There are some hidden opportunities to make money quickly. If it’s difficult for you, or you do not want to spend time on this, then you can run the Free mode. Here you will begin a game with a high level of starting parameters, and next to you there will be a chest with money and equipment.
Regarding your request, can I first ask you to rate the game? :) Thank you!