Question two, where do i buy a soul catching spells, or a staff that does that, preferable a spell though,
The Mage vendors should sell Soul Tap - might have to be a Conjuration specialist though. You've probably figured it out by now, but you don't need Soul Tap for dragons.
Since this thread is already titled: has anyone had a dead dragon not burn up and you absorb the soul? :\ Is that a random thing or did one of mine just glitch?