Welcome to BYC! Glad you decided to join our flock. Brahmas and Sussex are both wonderful breeds. Brahmas were the first breed I ever had (about 50 years ago) and they were gentle giants. My children made lap pets of both our Brahmas and Sussex. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck in keeping your rooster.
and Welcome To BYC! There are a number of threads on the rooster collars if you want to do a search, ie

!!! This is the BEST CHICKEN KEEPING FORUM ON EARTH!!!!