I'm making a bard and it says I have 2 cantrips and 4 spells, and I just have no idea where they are and how to establish them at all.
Cantrips are Zeroth-level spells
As such you can cast them as often as you'd like. ("Leveled" spells cost spell slots, which are a finite resource.) You can find more about the details of spell levels on pp.201-202, "Spellcasting."
A Bard gets cantrips...
from the "bard list" starting on p.207. The individual spells are then detailed in alphabetical order from pp.211-289.