The Dark Three (The Dead Three)

Ever since the first time I first read about Bane, Bhaal and Myrkul, I have been fascinated with their story. I always thought to myself how much it would have made a good novel.

So my question to Forgotten Realms scholars out there is this: How much do we actually know about these three when they were mortals?

We know an awful lot about them as gods, including their chosen avatars etc, but very little about them beforehand away from the story of how they became gods.

So far I have discovered just a few things.

A) They were all most likely human (Bane and Myrkul definitely. No information for Bhaal though).
B) Myrkul was from eastern Faerun - his full name is Myrkul Bey al-Kursi and he was the crown prince of Murghom.
C) Bhaal was a LE assassin, Bane was a LE fighter and Myrkul was a powerful NE necromancer.
D) Bhaal favoured the bone dagger and throwing daggers. Bane favoured a black gauntlet (and possibly a mace?), and Myrkul used a scythe as a god, but more than likely a staff as a human (I may have made that last bit about staffs up :P).
E) They were friends...somewhat.
F) Well that's about as far as i've gotten...

I'm asking because I am planning to draw an illustration of the three. If anybody has any more information other than the tidbits I know then feel free to help me out. Any information on mortal DnD stats? Appearance?

Thanks all,

EXII