Hi, I've been interested in photography for a while and i'm soon going to take the plunge on my first DSLR. I've been doing a bit of research into which one to buy and I think I have settled on a Nikon D90. I could do with some advice on which lens/flash to get. The main uses for the camera would be outdoor/nature (including low depth of field) type photography and the other would be low light situations such as clubs/parties. Would I be able to do all that with just 1 lens? As for a flash, would an SB-600 do the job for the clubs? Sorry if some of that doesn't make sense, still getting used to the terminology!