Welcome halfwitty.
The NRA stamp was issued in 1933; 1c precanceled Washington (it is Scott 1031, Scott 1054 is a coil stamp) and 2c Jefferson issued in 1954; $1 Postage Due first issued in early 1930s. All the rest were issued in 1938. Although they are relatively old, they are very plentiful and thus valued at around 15 to 20 cents each, except for the precanceled Washington, as quoted by nuggethill. But be aware that these values are relative to market demand and not guaranteed values.
Their greatest value is found in the enjoyment of having a fine collection and your stamps would be a great start for a great hobby.
Marty