I have a Nikon d5000 with the 18-55mm, 55-200mm and 35mm. For shooting boudoir and maternity and my kids outside once in while what do I need. Could you describe or point me in the right direction to find the difference between lighting. Like the SB-600 I read about or just lights on a stand. Are the lights on the stands flashes or just lights? Please help me. I tried to search but am not really finding what I need to know. I am sorry if it is here somewhere and I have overlooked it.