Помогите мне!!! Британский знаю плохо , сама не справлюсь!!

We are not going by car because there is too much traffic in big cities.We are not going by train because it takes too much time.Besides there are no return tickets for the dates we asked.My father already bought plane tickets.This is the first time i travel by air.I have already written the list of things I'm going to take with me.I take much luggage because it's summer and the days are nice and warm.I think I take my umbrella in case it rains.My mum hasn't packed our suitcases yet.I always do that.