Congratulations! You've got yourself a casual or part-time job. Here is some useful information.
Headspace - tips for starting a new job
Fair Work - casual employees
Fair Work - young workers and students

I was quite curvy as a teenager and hated shopping for swimwear with a passion. This was back when dinosaurs roamed the earth and women's boardshorts, kimonos and rashies hadn't been invented. There are so many more options available now, not that I'm saying you should cover up if you're a larger size. The difference between beautiful big girls is their confidence. If you own your shape and dress to flatter it you look gorgeous, no matter what that shape is. If you're on a budget, K-Mart has a great range of swimwear and accessories. Some of them have tummy control and underwires. All of them are well priced.

Teen Compass has a Wellness Assessment survey that you can work through and see what areas of your life might need a bit of work. It covers relationships, emotions, spirituality, rest and play, resilience, care for body, organisation and school and work. You can find it here.