YOUR FIRST TIME (EATING INDIAN FOOD)
My best response is: If you haven't ever had Indian food before, try a buffet. Most Indian restaurants offer them daily for lunch (and on Sundays, many even offer brunch, including champagne -- not an Indian beverage, but a welcome addition nonetheless) and they range in price from about $8 to $15. They typically offer some of the most common Indian foods, usually including a few veggie dishes (like saag, the curried greens dish this blog is named after), meat dishes (like tandoori chicken and chicken or lamb curries), rice, and a dessert or two.
If you can't make it to a buffet and are ordering off of a menu, here's what I recommend:
After you've had your first Indian meal, and fallen in love with the cuisine (I hope), definitely come back to saagAHH for info on the best places to put your newly enriched palette to the test. By the way, all of the above recommendations are for North Indian cuisine, which is the most common kind in U.S. restaurants and the kind I'm most familiar with. However, if you do find yourself in a South Indian restaurant (you'll know if any of the above items are missing from the menu), then go for a dosa, an Indian "crepe" (made from lentils) -- and fill it with whatever fillings you like best (potatoes dosas are one of most popular). Happy eating and let me know how it goes!