B&H has great selection, but I find Amazon to have better prices especially if you are ok with buying used (which you should).Here's
a start for lenses, they have an excellent lens search. You just want to make sure it is "macro." Once you think you know what you want, then search that lens and see if it gets good reviews and what the competition is.
You will definitely at least need two strobes/sources of light.
I'm not a pro at studio stuff, but here's how I would breakdown your budget: $900 on camera, $600-$1000 on lens, the rest on strobes/lights.
I think if you need to cut corners, I would do so on the camera body. I would also get comfortable with photoshop so that you can make up for a cheaper setup.