I would need to study this camera you have because I've never seen this word "Nikon"
But get a fixed length lens in the 30 to 40 range (or less - something that gives you less than 1x image size with your sensor.)....with the fastest f you can afford.
check that....one stop faster than you can afford (f/1.4)
For people, avoid flashes mounted on your camera especially tall ones. The farther they are from your lens, the bigger the shadow created.
Do not use the crap flip up flash if your camera has one.
If you struggle with lighting for set up shots, study it on the web and go talk to Houston Camera Exchange.