Looks absolutely gorgeous running on a One X hooked to a Samsung KS8000, using settings from rtings.com. I really hope this gets worked out soon for you PS players. The game is stunning.
Horses are available to purchase for $0 at the Valentine Stable after completing a mission with Hosea in Chapter 2. Guns are available for purchase for $0 at any Gunsmith.
Bounty Hunters shoot on sight, but law men will allow you to surrender if you aren't "Wanted: Dead or Alive". You'll spend some time in jail and they'll take some of your money. Of course, my bounty was $15 for stealing a horse, $5000 may be a different story.
You can either maintain it with gun oil by clicking the right stick with it highlighted in your weapon wheel, or swap it for another weapon after killing someone. There is a Schofield Revolver in the back room of the Dr.'s in Valentine. Rob the backroom business and swap for it.
My weight went from Perfect to Average pretty quickly. Here's the current stats...
Stamina Drain Rate +4.5%
Damage Absorption -4.5%
I believe this means I'm becoming underweight. But I think I eat pretty regularly.