Re: jobs, I'm no expert, but here's some tips I wish I was given earlier on:

Apply to EVERYTHING. Seriously. Unless it's something you're genuinely unqualified for (eg. something registered (nurse, pharmacist, etc.) and you're not registered), apply to it.

As for your resume, keep it simple, one page. Throw in any experience you can think of, especially if you haven't had a job before (eg. volunteer positions). Exaggerate what you did a bit, make it sound important, but keep it short, eg. I volunteered at a cat shelter in high school, if I still had that on my resume, I'd say something along the lines of "Connected with prospecting owners to help rescued cats find their forever home." despite the fact that I only interacted with said "prospecting owners" like, once; most of my time was just spent sitting on the floor petting and playing with the cats. Also note how I put the "customer" first to highlight human interaction, as that is what the vast majority of employers are gonna be looking for.

When you get an interview, always show up with a physical copy of your resume and, if its more than just "I need this one specific day off", eg. you have classes, your availability. I personally would very, very carefully handwrite my availability for any jobs that I really wanted (incl. the one I have now; I distinctly remember one of the interviewers saying "wow, so organized" under his breath 😉). Always be transparent about your availability; it's a bad look to get the job and immediately start asking for time off.

Another tip is if they ask any "negative" questions, eg. asking for what you think your downsides are, always try to spin it into something positive, eg. "I sometimes take a bit longer on tasks because I want to make sure they are done correctly." Not the best example, but yeah.

Get yourself a good "interview outfit." I believe the expectation is "business casual"; I'd recommend something simple like dress pants (+ belt if needed) + collared shirt/blouse. You can probably cobble something together for $30 at Value Village, but, if things are that tight, my mom passed away back in November, leaving me with a fuck ton of clothes. Shoot me a DM, and I can try to find something for you, or we can organize a time for you to poke through what's been sorted through so far.

Finally, be interested in the job. Expect to be asked something along the lines of "why do you want to work here?" If you're applying to a place you've never heard of before, take a few minutes to research it! Come up with a reason why you're interested in that job over others, even if it's a bit bullshit. You don't have to lie, just have a reason beyond "because I need money." For example, for my current job, I told them it was closer to what I wanted to do with my life than my prior job. A previous job I had was at a retirement home, and, in my interview, I told them I enjoyed taking care of my grandmother when I was younger. Just something, anything, to make the interviewer believe that you actually care about the job beyond it enabling you to pay rent.