Absolutely clueless about taxes

So I'm fresh out of high school, got a part-time job and made some money (not a lot, but y'know). I've been told by my parents to get my taxes in order and even though they said they'd help me do it I've been basically solo this whole time.

All the information I've been gathering helps people that have either a CRA account or a NETFILE access code from the notice of assessment thingy? I didn't get a notice of assessment and have no clue where to get one.
I don't even know if I can get one because I've never filed taxes before.
So I have no information. Unless I missed a holy website that answers all my problems

Any help? Please?
I'm so clueless