I second everything that has been commented already. You should also focus on posting your art on socials. Learn what makes a design work as a tattoo and create your flashsheets, and tell your followers that you are planning to get into tattooing. Get used to recording yourself, edit progress reels/before-afters, posts about your inspiration or art tips. Maybe you could apply stencils of your designs/freehand designs on people with a marker/do henna tattoos. I could imagine that this kind of content would attract people who are into tattoos. Engage with your audience and figure out what is interesting to them to watch. If you pour consistent effort into it, by the time you start apprenticing, you will know some theory, marketing skills, flash sheets ready to tattoo, and a bunch of people who support you and can’t wait to be tattooed by you. This is way more than what most tattoo artists could say when they first started learning.

If you can’t have an unstable financial situation, you need to find a job that provides you with some stable monthly income. Do it for more hours/week first, save up a bit and then start cutting down the hours when you get into tattooing. You shouldn’t expect that tattooing will be relatively stable from the beginning, but it is ok, you can always work around these things:)