Whatever interests you!
You might want to start out small—say a date collection for the year you were born, or the 50 new quarters as they roll into circulation.
Then again, maybe you dream big and hope to build a sizable type set collection!
What other types of collections can you start?
You could save coins with animals or plants—Buffalo Nickels and Wheat Pennies, for example.
Or coins with funny names like the Silly Head Cent.
You can always round out your collection with foreign and ancient coins.