Hair washing advice to the new-to-dying

[Reiltin]

Spurred on by a thread here about dying your hair, my brown hair is now purple. Ish. A pinkish-purple. Either way, it's fun and fab!

But I don't know the best way to care for it so it doesn't fade too fast. I usually wash and condition my hair every other day - otherwise it gets greasy. I have shampoo and conditioner for coloured hair. What else do I need? Any amendments I should make to my usual routine?

Thanks!