@Htx - our friend GeoffHa has already plotted the landscape pretty well. If also considering the postmarks, a few things to observe:
The 40 c Ceres (Yvert 38) has quite a good 'Anchor' strike, used for letters carried at sea. The anchor cancellation gives this stamp a 6x premium, increasing from 6 to 36 Euro.
http://marcophilie.org/x/x-cot2-i.html . Nice centring to, but a realistic retail value around 3E due to the missing corner perf.
A few interesting ambulant postmarks as well ('DS2') however the stamps are in poor condition, unfortunately. Absolutely collectible - but minimal value.
You have a few beautiful SOTN numeral postmarks in the first group - '2818' and '3112' - unfortunately these numbers are quite common. The '3812' is more rare - it was cancelled in Saint-Rémy-de-Provence, only 6000 souls were living there at that time.
May I suggest you collect the different numeral postmarks you are able to identify? Use this site for finding the relevant town for each numeral
http://marcophilie.org/x/x-prov-i.html