I am new to photography and work with my wife's canon ae1. I have a lens (I know nothing about it) - I'm sure it's just the standard 50mm. I want to get into doing mostly black and white landscape photography. What are some must haves lens wise? I know nothing about lenses - but I'm thinking a wide angle would be a good start? What do you think I should start playing with first? Telephoto? Macro? Wide angle? Thanks!