Originally Posted by enoteware
With respect to soul gems (without giving too much away) there is a great item earned after completing a quest that has you look in an abondened house in Markarth. As soon as you get the option to run that quest do it, it's not super long and the reward is reeeediculous.
I've been there.
though I will say that soul trapping with a bow is WAAAAY easier than with a mace. I got an axe pretty early in the game with soul trap but I was a bit too ambitious trying to trap the boss level bandits and trolls I became good friends with the F9 key.