Eowyn, it is great that you want to transform your life
As for starting business, you should really figure out what you are really, really interested in, however silly/not traditional that field might be. What is your passion. What would you like to think about every day, read and speak about a lot etc. etc. If you don't have such a passion yet (it was like that with me in high school, I was too good at too many things), make an intention to find it and try things you have always wanted to try, but have delayed for some reason

. Or try to look at those many things you like to do from a different perspective. What is common to all of them? Perhaps there is some underlying tie to all of your interests.
Then you should figure out how can you turn it in a service for people around you. How can you share your passion with other people that would benefit them (since money in your pocket is basically always generated by the benefit you can provide other people. If you have a million dollars, it means that other people have benefited by this amount from your actions).
Then step out and give it a try. In most cases you should be able to do it while still holding your day job. Find a nonprofit that could benefit from your work, start a website, perhaps some family member needs the service you would like to provide. See if you like it. Perhaps you need to develop some personality traits to do it consistently, but you should like doing what you have chosen to be your business a lot.
Avoid these mistakes:
1) fear that your chosen field will not be profitable. all businesses can generate income, if done properly.
2) permanently tying your working hours to your income. find a way that will bring you money from your business while you sleep, play with kids etc. I have done this and can surely tell you it is wrong, no matter how much you charge per hour

Steves article about the 10 000$ hour income explains this mistake very good.
All the best wishes with your pursuits! The decision to start your own business is a great and very good one, good luck!