The current collection of Quick & Flupke books available in French go like this:
Haute Tension
Jeux Interdits
Tout Va Bien
Toutes Voiles Dehors
Chacun Son Tour
Pas de Quartier
Pardon Madame
Vive Le Progres
Catastrophe
Farces et Attrapes
Coups de Bluff
Attachez vos Ceintures
As finlay said, they're not meant to go in any order, but several 'skits' follow up on previous ones.
For example, in Pardon Madame, which I have, there are four two-page stories about how Flupke wastes his money buying a lottery ticket and the lesson he learns from it.
Others are simply one-off gags.
The earliest strips were published in Le Petit Vingtième, and a few more were drawn for Tintin magazine years later.
You can easily tell the difference, particularly in the level of crudeness of Hergé's drawings of people, especially their facial features (stub noses are very common), which decreases over time.
Many of the Quick & Flupke stories are very amusing, and offer a look at another side of Hergé's creative energy, disproving what some have unjustly said, that Hergé didn't know how to inject humor into his cartoons. | 
