Visiting the Maine Ave. wharf

I'm considering visiting the Maine Ave. wharf area next weekend with family, and I'd like a few questions answered before I go, so as to stand around looking confused as little as possible.

When I checked out the area earlier, I noticed that everything had prices, except for the live crabs. Are you supposed to haggle with the sellers over the price?

Will they sell a couple dozen live crabs, then cook them for you on the spot?

I saw a covered eating area on the east side of the fishmongers, do you take your food and bring it over there? Do they have utensils, napkins, newspaper, etc.?

Will they cook fresh non-crab for you too (fish, shrimp, etc.)?

I've read that the actual catch comes from places like Jessup; is there a similar area over there that would be even better to try, assuming enough time to drive?

Thanks from a confused transplant.