I use Easton XX-78 Super Slam 2219 aluminium arrows and Muzzy 125-grain broadheads.
I prefer the heavier arrow & broadhead for elk. I have killed 4-elk with my bow and several with a rifle. A good rule of thumb for elk is to go "heavy for caliber". This works well for rifle & archery hunters.
There are several archery elk hunters on this board that will help point you in the right direction. IMHO elknut will give you the best advise.

There is a bunch more information you will need before your hunt. Look at all of your gear, boots, socks, pack, knife, saw, clothing. Also pick up two cow calls & a bugle, then take the time and learn how to use them.