Moving out help!!! Advice wanted

Hey guys, I’m 16 almost 17 and I want to move out around 18-19 because that’s when I graduate highschool. My family is really toxic and I can’t live with them any longer than I have to. My steady long-term boyfriend and I are planning to get an apartment if we’re still together by then, which we probably most likely will. I don’t have much money and want to start saving now for the future but I don’t really know how to do that. Do you guys know any advice I could use as much as possible.