Welcome to BYC!
Everyone here is always happy to help, so feel free to ask questions in the Forums. The learning centre in the Articles section have lots of useful info too!
Welcome to BYC. When I would buy several of the same breed, I'd dye one feather with food coloring. It helped me to distinguish them until I could fet to know them well enough to see their differences.
Hello! Your Light Sussex look like they are all dressed up and ready to go out! Here's one Australia Members' Thread if you are needing regional expertise on anything or just want to say hi.
Thanks for joining and welcome to BackYard Chickens!