Here's a pretty good idea of the most popular Vietnamese dishes
https://www.houstonpress.com/restaur...uisine-6402510

Personally, I wan't to venture out and get creative with my Vietnamese, but if I find a place that has awesome Pho broth, I basically never get anything else. Add in all the siracha, all the jalapenos, the basil, the bean sprouts.... Can't go wrong. (skip the siracha and jalapenos if you're not into spicy)

I should also add: Be careful with what you ask for in your Pho. Most traditional, or authentic styles, include tripe and tendon which can be texturally off-putting to a newbie. Stick with the rare eye-round, fat brisket or well-done brisket unless you're feeling adventurous.