I do have some years in between... But how do I find out what the value of these coins r and how do I clean them if at all?
Those are average circulated Lincoln cents. Nothing rare. DO NOT Clean your coins. I subscribe to CoinAge magazine for fairly up to date prices. http://coinagemag.com/ The RedBook is an excellent reference but only published once yearly.
Don't clean your coins! All three are common date coins and average condtion. The trio would be worth less than $1.