Three tips for you when posting:
1) Have a specific costume in mind
2) Ask specific questions (i.e. what material should I use to make the fish scales, etc)
3) Make a cohesive post expressing your questions with good grammar and such
I don't mean to sound like a jerk, but there's nothing anyone can do to help you when you have a post like this... so please try again and I'll be happy to do what I can! ^_^
Also, check out the PLC costuming thread that already exists to see if people have already asked/answered questions that could help you! Good luck!