Fn-up arrow = page up
Fn-dn arrow = page dn
For reference, here is Apple's list of system shortcuts:
https://support.apple.com/kb/HT1343
Definitely learn the key symbols shown at the top of that list, as menu items have their shortcuts displayed symbolically.
I also recommend you get friendly with the Help menu, which is always the rightmost menu. Typing "keyboard shortcuts" in there provides a lot of this information.
Welcome to Mac.