I suggest starting with a Whitman coin album for your Wheat cents to view what you have and to create hunting goals. It's hard to believe that 100 year old pennies can be spent with little actual loss, but it's true. There are just a few Lincoln dates with any value: 1909-S VDB, 1909-S, 1914-D, 1922 No D, 1931-S, 1955 Double Die, 1969-S Double Die, and of course the 1943 copper. During this hunt, particularly if you're looking at double die coins, be sure to review the difference between actual double die (valuable) and mechanical doubling (worthless) as the latter has beguiled many new collectors. Tell you son about some of the history during the year one of your coins was minted, how much things cost back then, etc. I still find that aspect fascinating.