Yeah, I want to start my own company connected with various art in future, however I don't know at all when I can so this because starting a business, especially a successful one isn't an easy thing at all

You need to find a really interesting and competitive idea because there's such a great competition now almost in all spheres, and also a sphere where that competition isn't too great and won't cause a fail to your startup. Other important things are good, qualified work team, network for your partners and clients, effective management system and using various tech innovations
https://idapgroup.com/blog/deeper-dive-progressive-web-apps/. Oh, and advertising, it's a very necessary thing too, without investing much money in it there's a great risk for fail too. And yeah, you'll need to have a start capital for all these things because together they'll cost really much money and you'll be able to get good profit only after several years at least. Patience and hard work are important things too.
Personally I'm not ready for this at the current moment but maybe in future...