Sara, there are no silly questions, only people who ask questions when they have no intention to learn. If you need info, however basic, and intend to profit from it and use it, it is a good question. If you aren't asking questions, you either know it all (which is no one), or you have stopped learning.
Taking cuttings would depend on how much growth you had. I want my trees to be more like bushes, so I prune them to about 18", and let them branch low. In that case, anything above 18" is a cutting for propagating with.
If there is a chance the potential cutting(s) my be ruined may be damaged by cold, then take them in the Fall before first frost or freeze. Here in San Diego, they are seldom dormant much before the end of January. If you are not ready to use the cuttings, better to store them on the tree (uncut) than in a frig.