1, theye are synonims. "lel" is more prosaic, in everyday speak "talál" is more common 2, "puszi" is kiss on the cheek, "csók" is kiss on the lips. You give "puszi" to your friends / relatives. You give "csók" to your boyfriend/girlfriend/ etc... But there is the expression "Csókollak!" - that is without any sexual meaning, just "sending kisses" as a salutation. 3, they are synonims, in use if you want to refer something phisically far away usually "messze" is the word you use, "távol" can be used in more abstract meaning (eg.: "Távol áll tőlem valami" - I am not interested in smth), but also in physical distance.