Hi MissN1
Welcome to the Community!
Regarding Jersey, I am probably a little biased because I was born here and have lived here my whole life, but you will love it - it's beautiful and, if you like seafood or water sports, it's Nirvana :)
Happy to help if you have any questions about the island - September is a great time to come because the school holidays are over but the weather is usually pretty good and sea is at it's warmest (if you are brave enough to dip!).
Don't worry about it being your first trip - you will be with a group of people who are all keen to have fun and will be well supported by your Tour Manager. I've been using JY for nearly ten years now and have always had a great experience.
All the best
Mandy