You can raise your hand with a bid smile, you'll be served correctly. If you want to order something, you just have to call the waiter/tress by saying: "Excusez-moi" or saying : "Monsieur" for the waiter or "Mademoiselle" if it's a young waitress or "Madame" if it's an older waitress. The quality of the service depend more on the location of the restaurant then the price of the menu: if it's a tourist restaurant, in Paris, you'll be really badly served. if it's a stared restaurant, you'll be well served if it's a modern restaurant in Paris, or a simple restaurant in another city of France, you'll be well served in most of the time. In rural restaurant, the waiter/waitress are more frendly than in the capital, even if they don't really speak english. The simplest way to know if you'll be goodly served is to watch the face of the waiter/waitress. Search the smiles ;)