The top one is a bolt action shotgun maybe a Marlin, they made a lot of bolt action shotguns, or Mossberg, the black plastic finger groove piece behind the trigger guard is a common charicteristic of their guns. I can't be sure of the models as they were made for a very long time under different model numbers by both makers. The model and caliber (12ga. 16ga., 20ga.) should be marked as a stamping on the barrel just in front of the reciever on the left (opposite from the bolt handle) side.
The smaller one appears to be one of the .22 Winchester rifle's meant for youth shooters, its a single shot, right? They were also made for a fairly long time and in good condition can produce acceptable accuracy. They were very inexpensive guns, but older ones can get a decent price these days if they are in very good condition. Unfortunatly that one isn't.
It should also be marked the same way on the barrel in front of the reciever with its maker, model and caliber, probably .22LR,L,S. Meaning it will take .22 caliber rim fire cartridges in .22 Long Rifle, .22 Long, or .22 Short.
Have fun, but don't try shooting either of them before you have a decent gunsmith check them over. They don't appear to have been cared for very well and may not be safe to use.