I don't think so. Pretty much make the story as we go. Could be the lot of us found our way to Waterdeep at the same time, for the same purpose, to get rich in Undermountain. I don't see a need to say we did or didn't know eachother beforehand, although perhaps having smaller groups merge into one larger group might be interesting. I agree about the no passing thing too. Come as you are, and we'll work out loot distribution as we go.
Another point, I'm thinking that it might be better to plan on taking a while, and not planning on making a stone run type event. Poke our noses into every corner, to see what we can see. We can designate a party leader, and either follow the leader throughout, or do party votes for any decision making we have to do. Might be good to pretend no knowledge of the dungeons as well.
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