I'd recommend going to freesound.org or some other site like that to get used to what different objects can sound like/if you don't want to make your own. It'll be up to taste, but I personally like to use sounds made from either paper or ceramics and will start there, then maybe change their pitch a bit to make it sound better (randomized pitch, in general, is pretty good idea too). Sound design is definitely hard, but like the rest of game design, it just takes practice to do lol