How do I go about getting stuff to gift people for secret Santa I'm having trouble finding the items

You can use the search bar at the top of the page to search user shops. Just be aware that users are usually asking for items that they're struggling to obtain themselves, so they're likely to be on the rarer/pricier side.  Any items people are asking for that you already have on hand will show up first in the secret santa so you can see what you have to offer.