A great place to train your ranging with your bow when you start the game: Far enough into Therinsford, you will come across a dragon saving stone and some arrows. This is right before a river that you can cross. Take the arrows and keep on killing the guys. Go save, exit, start game, your file, and the arrows are back, with the enemies! Keep on repeating this and you will eventually reach the max of your ability.

P.S.: The max arrows you can carry is I think 50.