Congrats man, welcome to the jungle...;)
Well, there is lots of advice. A lot depends on who you are and where you want to go.
Make sure you have good shoes.
Be early every day. Keep your knives sharp. Be clean, organized. Be positive and willing to work hard and often.
Ask a lot of questions. Make the chefs and the cooks tell you WHY. When you are not busy, help out other stations. Watch, learn.
Fry is pretty much a no brainer station. Not saying it isn't hard, or busy, because it will be. More than likely, in a chain-seafood restaurant, you will do a crap load of fried fish, calamari, apps, etc. You WILL be busy. The no brainer part means that it's pretty easy to tell when things are done and ready, presentations are usually a snap and you will do most things a la minute. I'm confident you will get the hang of it in a week or less. You'll probably have no choice.
I don't know what else to tell you man. Don't listen to the haters--there will be jaded, jerk off cooks, (maybe there will be), don't let them bring you down. If you see laziness, dangerous/innapropriate behavior, harassment, etc, don't be a part of it. Don't play into it. Be above it, be professional, and you will be fine.
And clean. A lot.
Good luck, let us know how it goes.