Pictures would be a big help.

The assembly date of the bike should be stamped into the head badge. Look for four small, lightly stamped digits. The first three digits are the day of the year (001-366) and the fourth digit is the last digit of the year. The decade is determined by decals and components.

Once you find the assembly date, check out the Schwinn catalogs HERE.

After you figure out what year model it is, search eBay completed listings for sale prices completed auctions of similar bikes.