Welcome to another Michigander. Lots of information here. Al and Ken have pretty much covered what you need to get started. A box or three of factory ammo should be enough to get you sighted in and do some playing around with your new toy. But I would not use those to go after deer. Had some bad experiences with the 250 FTX. I switched to Barnes and haven't looked back.
Midway currently has Starline Brass on Sale for just over $30 for 50 cases. That's a good price and Starline is what I prefer. If you keep watch on Midway they also run Barnes bullets on sale every now and then.
I had reloaded both the 200 & 275 XPB. My most accurate is the 275 using 300MP (Thanks, Al). I am actually thinking of just using the 275gr to stream line operations. So far all the 450s I have tried it in seem to do well with it.
Hornady dies are my choice and have done me well, plus Hornady customer service is very good.
Good luck and keep us posted on how things are going for you.