I'll chip in on the ones I know.
The Glenfield .22LR is an older version of the Marlin 66. Wood stocked, pretty plain. Very common. Value? $75-125 in good condition.
JC Higgin's 20-ga. Again, a common simple shotgun. Used to be able to buy them at Sears, Montgomery Wards and other places. I don't think yours shows much special about it, so again the value is pretty low due to common-ness.
The military rifle looks like a trainer, especially in .22LR. Not rare, but less common any more. Probably pretty accurate.
The others, especially the old Remington shotgun are out of my range of experience so I'll let other chime in.
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