AU Tickets

When I buy an airline ticket, no matter if it is in Economy, Business or First class, all the tickets are coded with classes such as ‘Y’, ‘D’, ‘C’ etc. These are apparently the rescritions/conditions that apply to the ticket, which are not fully explained at the time of purchase. It is not possible to get the full explaination when tickets are purchased online and the travel agents are usually very coy about it when asked. Where can the traveler find this information easily in advance instead of only when changes to the travel plans needs to be made but can’t because the ticket has been bought with these restrictions.

I need airline tickets to Florida for the dates of March 17th and return March 21st. Leaving the Newark (NJ) airprt & returning there. Tickets can be anywhere in Florida. Looking to purchase them cheap, can anyone help? Thx!