Sushi's one of my favorites. I don't know what's on the menu at any of the Sushi places at Disney but here's a primer on some basic sushi
There are two basic types.
One is Nigiri. It usually comes in one or two pieces per order. It's usually a strip of raw or cooked fish on top of a (for lack of a better description) sausage shaped ball of rice.
The other is the rolled sushi. (Maki) It usually comes in 6 pieces per order. Here in the states, this is usually (though not always) done with the rice on the outside. I see from the picture, that the lounge sells at least some of its rolls in 8 piece orders.
Nice.
Many places will also have some sort of mixed sampler platter with various Nigiri and Maki and sometimes some sashimi where the number of rolls and pieces varies. They'll always tell you what's on em and how many.
Now this isn't sushi but you'll find it served in most places. It's sashimi. It's pretty much the strip of fish as in Nigiri, but without the rice.
One popular place in Atlanta has a buffet. Right next to their Nigeri is a big sign. IF YOU WANT SASHIMI, ORDER IT OFF THE MENU... YOU MUST TAKE THE RICE WITH THE NIGIRI. LMAO!! I guess people weren't eating the rice so they could have more of the fish.
If you're squeemish about raw fish there are plenty of types with the cooked. Also, I'd start with the Maki. For a first timer who's squeemish, a big strip of Raw Salmon Nigiri staring you in the face can be quite intimidating. Plus, the rolled has a greater rice/fish ratio and the piece of raw fish isn't so big. Plus, it's in the middle, not staring you in the face right on top.
For the first timer with the ewwww factor present, Try some of the cooked rolls first such as the Californial rolls (cooked crab, avacodo, and cucumber, usually rolled in smelt roe) some crunchy shrimp rolls and some tempura rolls. They are all cooked. Then go directly to eel. It's a good one for first timers to get away from the basic ones above. Then try some of the raw rolls. Then go to your Nigiri as the ewww factor lessens.
P.S. It will not even be close to the Ewwwwwww factor of raw oysters. So don't worry. I do Sushi all the time. I did Raw Oysters and have never had the desire to do em again.
Oh and the green stuff in the picture is spicy. you put it in your little bowl of soy sauce (A LITTLE BIT AT A TIME NOT THE WHOLE BALL OF IT) to spice it up. I usually throw all of the wasabi in by the time I'm done but I like it hot. Most people use less than 1/4 of the ball you see there by the time they are done. The pink stuff is Ginger. You're supposed to eat it between the various kinds of sushi as a chaser to cleanse the palate. But I like to just throw it on top sometimes, and others in the family simply wont touch the ginger.
Hope that helps... Man does that Sushi look Good.