Try to use the delicious green Le Puy lentils. This is not essential, but they are so very good.
If you don't have any smoked bacon, plain bacon, diced ham or sausage (preferably smoked) will do fine.
And to drink?
I recommend a red without too much tannin, such as the uncommonly good organic Gamay made by the Balloux, a wine-producing couple based in Hugier (Haute-Saône, France).