With Mexican food, you'll each be ordering your own entrees, probably not sharing anything, though some appetizers are good to share. My favorite is quesadillas- two flat flour tortillas with melted cheese between- a kind of Mexican grilled cheese sandwich of sorts. Nachos are also popular starters, as are dips, like cheese, guacamole (avacado), or bean dip. All of these will come with more corn chips. Beware of eating too many corn chips at this stage, or else you'll feel full by the time your entree comes! Choosing a main dish will be a bit more confusing. After a while, it might seem like all the dishes are just different configurations of the same ingredients. Corn tortillas, or wheat. Sometimes crispy hard, sometimes soft. Shredded chicken or beef, sometimes fish. Cheese, tomatoes, guacamole, sour cream.
The most well-known dish is tacos, but other choices are also yummy. What you'll want to do, is take a tortilla in one hand, and then load the fillings into it with your other hand. Put the meat or beans on the bottom, then gooey things, like guacamole, salsa, or sour cream, then your vegetables, like tomatoes and lettuce. By having the lettuce on top, you can lay your finger across it while you eat without getting gooey ingredients stuck to your finger. If this sounds too messy, try an entree where you'll use your knife and fork.