! We're happy to have you joining us here on The Beach!
I'm glad that you are reading the book, but you don't have to follow the exact menus that are posted in there. They are suggestions or guidelines, and you can make your own substitutions from the approved food lists. As for your fish and seafood allergy, you don't have to eat fish at all on SBD. For your protein, you may choose from any protein on the Phase 1 list.
There are several threads stickied here in the FAQ section that you will find helpful and will answer many questions about Phase 1.
Come and join us on the Phase 1 beachers thread to properly introduce yourself, and please feel free to join in our daily chat, too. You'll find tons of friendly advice and encouragement to help you make SBD a success. We look forward to hearing from you!