Couple of adventuring questions

[Breach]

Hi Guys,

First play-thru, great game (though I hit BOTH the Mirabella crash and the Upper Hadar freeze , lots of questions ;-] (and lots of answers on these forums). Thanks for any of this:

- Quest question -- on Freedom Islands I talked with the brotherhood, did a quest and a guy told me about a mask which I should talk about in the orc embassy -- when I go to the embassy I get the option to fight the dragon (huh, what dragon and what does it have to do with the mask??) -- is there somebody else who gives you this quest, like officially with more info?
- I'm done with the Dwarven lands and am expected to return to the king -- however, I can also go to Demonis. Enemies there seem too tough for my char right now (I'm Mage, Lvl 20) -- should I return later?
- When can / should I use the submarine and where does it take me?
- When should I be able / try to take on the Double Future fine in the arena of truth and do the Mage range (I think now that I'm Lvl 20 I can take on the range, but still has to try, previously it was too tough).

Also, which are the more obscure quests / options to do things? E.g. I just found out (thanks to the forum) that I can give the idol's head to the Barbarian Chieftain?

Thanks!