i just started with photography. I have a 50D body on hand.(originally I want a 550d but i got a discount only for 50d for $800). And I am planning to get the prime lens 50mm to start with. and maybe a zoom lens too. Can anyone give me some advices on what lens I should start with? Sorry to ask dumb question, most ppl get their dslr with a clue what lens they shld get but i am too new to this field.