Soul Sacrifice: Save or Sacrifice?

So I had been waiting and waiting for the demo to come out and when it finally did I was bouncing off the walls. So far I have played through about half the demo from I can tell (and have pre-orded since playing) and wanted to start a topic to ask a few questions (because some aspects are vagee) and see what spells/choices you have all made so far. 

Personally, I have been sacrificing everything I possibly can. Although I can't really tell or see if there is a damage difference or buffs going on with my spells, maybe its just too early in the game. The combat thus far seems extremely fluid and fast paced and I get a sort of Dark Souls-ish meets Monster hunter kind feel but thats just me.

Also a few questions of my own:
-Martyr rewards, what are they and are they obtainable through the demo?
-After completing quests there is clearly some type of ranking, does anybody know all of the possible ranks?
- I attempted to start another character too but was told I had to save over my previous guy, anybody find a way around this or do we only get one guy for now?
-Is there a way to tell how many charges a spell has WHILE you are fighting?


 Happy hunting!

I also sacrified everything I came into contact with. Didn't really notice a huge damage buff though, also I *Think* the Martyr rewards are for when you sacrifice a body party for a spell. I got one after I used that inferno spell that burns your skin.

I've been mostly trying to save, but I've been sacrificing quite a bit, too.  I want to try to keep my save level a bit higher, but still make sure I sacrifice a fair amount.