Welcome aboard !All good info above. ^^
I pick it all up and reload about 99% of what I pick up. People that sort their brass by name find that one brand or another gives longer service, but if you're like most of us, you'll simply loose the brass in the weeds before the maximum life has been reached !!
So for the novice, I say just pick it all up and go from there.You definitely want to avoid...
? Steel or brass plated steel. This will ruin your dies and doesn't form up properly. Run a strong magnet through your assortment and they'll jump on board. You'll actually be surprised what you catch.
? It does need to be
Boxer primed, and display one central primer hole instead of the 2 tiny "snake bite" primer holes of
Berdan primed brass. (Most of these are steel, and so caught by the magnet trick.)
? Then finally the brass with the internal "step" is a known safety hazard. These have been withdrawn from circulation, but you still find them a lot on public ranges. Their interior looks like...
? Crimped primers on Mil-Spec brass can be a pain, but a common countersink tool will permanently remove the crimp area in about 1 second.
See if you can't find an empty Folgers plastic coffee canister, and when you fill one of those you'll have all the brass you need to start reloading.
And ask questions. We're here to help.