From what you've said so far your plans are going to change big time. The areas you mentioned are generally not hunted by people without horses/outfitters and I'm not just talking about for game retrieval. I strongly recommend you take the distances you're planning to go, and cut them into thirds and focus on areas within that first third of the distance from where ever you park. Trust me, or don't, but you will be changing your game plan at some point. That's also a tough time of the year for your very first backpacking trip.
Weather will likely be mild during the day and it will get below freezing every night. Or it could be snowy, it could be very snowy.
Don't always count on outfitters bailing you out for game retrieval. They might be too busy when you call, and there's a strong chance that wherever you are won't have any cell coverage to call them in the first place.
Hunting pressure will likely be heavy to very heavy, it's an over the counter season. You sound like an honest guy so I gave you my honest response. You can still have a successful, and safe season without trying to go deep into the backcountry.
