The A and B tag thing is for elk only. I'm pretty sure this post is asking about deer hunting. You have to choose a general deer tag or a whitetail deer tag. The seasons vary greatly depending on where you want to hunt. A quick trip through the regulations will help you decide. Once you buy the tag, then you can hunt in any of the areas listed under that tag. The tag you choose may have an archery season in the area you want or a muzzleloader season, maybe, and most units have an any weapon season. If there is a season listed in the archery section for the tag you choose, then you can hunt it, and the same goes for the muzzleloader and short-range weapon seasons. One thing to think about now rather than in August is that Idaho requires a bowhunter safety class or an equivalent. Just download the complete regulations for 2010 and read through the deer section; there will be a few changes to the 2011 regulations, but not many.