I think you should have atleast 3k in your pocket before you want to even think of using a DSLR.
Buying a good 2nd hand camera with kit lenses will cost you about 1k (if you are lucky), then you need a strobe (or flash), which cost from $200++ ( e.g. SB600, not really useful unless you using two or more) to $600++ (e.g. SB800).
Not forgetting tripods $100-300(since most cheap tripods cant handle the weight well), spare batteries, filters, remote control.... etc
Overall, I would say DSLR is not a cheap investment as it is pretty addictive to buy gears... do a search on "buy buy buy".... and you will know. Especially when you saw a cheap deal on the market place.... lol
PS: I am assuming the products in Nikon only, its still about there regardless which DSLR you are buying.