How do you save while renting and living?

Hi! I am 19 going onto 20 this year and am planning to move out with a friend in 2-3ish months and am wondering just how do you do it financially? I’d be paying $225 a week for 2 rooms to myself and my own bathroom in the house we’d share and I earn anywhere from $500-$900 a week, though I usually stay around $500-$650 but due to being on holidays from university I can work more. I have no real idea how much bills can cost for 2 people, and I only have 3.2k saved. I also pay $100 a month to go to gym at snap fitness, and also pay for Spotify $7 and then any gaming or streaming services I may use and then cancel when I’m not. My biggest expenses are my 2.3k car insurance and $770 rego. I’m really afraid financially and have no idea just how to handle this all. I want to be able to live, work, study and also try save for my future. Does anyone have any tips or advice? I want to become better with my money and learn ways to save as much as I can/know the cheaper alternatives to turn to