I just got a Browning Citori 12ga. that has 26" barrels, and a set of choke tubes for it, but I don't know which choke tubes to use.
We tried Modified choke tubes and they kicked too much so I went to Improved Cylinder and shot a lot better.
American trap? Try M and IM.
International? Will be hard to shoot it with 26 inch but the only option is F and XF. If you are fast shooter then LF and F.
Recoil doesn't depend on the choke constriction at all. It depends on velocity, load and forcing cone length. Simple school physics: m1V1=m2V2
m1V1: mass of a gun times velocity of a gun
m2V2: mass of a shot+wad+powder times muzzle velocity of all that.
Being a beginner and shooting from the 16y line I would recomand to try Light Modifiy or Modify.
In the same time I suggest to check your gun fit and take some lessons from an instructor to start with solid fundamentals.