DH nor I have every flown. We have bought tickets for our upcomming trip. Direct flight Buffalo to Orlando on Southwest. Without an extra fee, how much luggage are we allowed to bring? There is DH, Myself and DS (10)? Is it one suitcase and one overhead carry-on? Is there a weight limit on the suitcase? Nobody in his family has every flown either. Nor has anyone really recently in mine. Do I buy those little locks for the suitcases? Will I be able to have a carry-on and my purse????? Any advice and help is appreciated. Also, my sister is most likely coming too. She will be bringing her 17 month old--- what about her checking the stroller, car seat, portable crib??? How much extra for each of these???