If I might return to Conne's original post here . . .
Many people order something to nibble on while waiting for their main course to arrive. If that takes your fancy, you won't go far wrong by ordering a couple of spiced poppadums. (Lovely!)
You normally need to order an accompaniment (such as some type of rice or bread) to go with your choice of main course. However if you order a Biryani dish you won't have to bother because it automatically comes with pilau rice. Further, Biryani dishes aren't too hot, so you could safely order one without fearing that you'd need to reach for the fire extinguisher! I'd usually choose Chicken Biryani but Lamb Biryani is also nice.
If you don't go for a Biryani dish, and order something else, be guided by the 'heat' categories or symbols on the menu. Then add an accompaniment of either pilau rice or a couple of naan breads. (Cheese naan is lovely!). If you're a bit of a glutton, order both rice and naan bread!
Some people like a bowl of Raita (a yoghut-based dip) with their meal but it's entirely optional. (Some Indian restaurants even provide it free of charge).
Indian restaurants don't usually offer a wide range of desserts but their ice cream (Kulfi) is lovely. It's denser and creamier than British ice cream, so have to hack into it with your spoon, but it's one of the best bits about visiting an Indian restaurant.
Don't bother ordering any type of wine to go with your meal. The flavours of Indian food are far too strong. Either order a lager or a lassi (which is a yoghurt-based drink).