My first practical handgun hunting revolver was a 8 3/8" M57. Go 6" or longer barrel and in whatever action you prefer. But a single action Ruger is just fine as it is pretty much a one, or perhaps two shot deal.

As far as factory ammo is concerned, at first you get what you can find at whatever the going price is. Although expensive, the Remington 210 gr SPs are good. (Remington loads them seasonally.) I suggest 210 gr SP's or the XTP's for deer. As time and interest allows, you begin picking up ammo and build up a bit of a cache. Then you probably start reloading.