It depends on the status you are looking to portray. Certainly antler/bone doesn't seem common past the 11thC, though it shows up intermittently in italy in the 1400s & 1500s. Keep with wood, perhaps wrapped in leather. It's important to make sure it's a good hard wood, that's well worked. There are some images elsewhere on the forum
, don't be afraid to use the search.
I'd highly recommend getting a copy of Oakeshotts 'Archeology of Weapons'. It's a wonderful book. I'd tell you what it says, only I think Martyn took my copy to Leitrim with him, and it's years since I went travelling up that direction. For Irish stuff particularly, The Archaeology of Celtic Britain and Ireland is good, and has chapters on knife & axe finds.