Welcome! FE= Fish extenders. Basically it's like a gift giving group. Everyone has a different level of craftiness so don't be afraid.
You make or purchase a Fish extender (let me know if you haven't seen these). It's totally optional and participation is pure voluntary. Now up until a cut-off date folks who are sailing the cruise sign up to be a part of the "FE group". You make small gifts to your choosing, whether be individual gifts, cabin gifts etc. It's all up to you on how much you spend or give, it's just about giving and having a good time. You will also receive gifts. This is not my first cruise but my first time participating. Let us know if you want included or have any other questions about it. You might want to join a FE facebook page for ideas or more pics. They are absolutely great on there.
My oldest son will be 15 at sailing. I hear teens have a great time so not to worry! Our tablemates on our last cruise was a single dad with 4 kids. 3 of the 4 kids were teens and they LOVED it. We had a blast with them.