Just bought the azalea deck precon, what now?

I bought the archer precon deck cuz I wanna get into the game and it seemed fun. What are some simple upgrades I can do that don't break the bank? I know the spring tunic is used everywhere but it's like a hundred bucks and I don't wanna spend that much right out the gate even if it puts me at a disadvantage. Are any cards in the deck banned also? My first cc night is tomorrow and I don't wanna get called out.