thanks guys, I noticed a shot of a baby with the ears out on a 1.4 50mm, the camera I use is not full frame so I think the 50mm would be 1. cheap and 2. great for the dof I need, but I seen a youtube video with a guy showing that a 180mm shot is best for totally throwing off the back drops, I am mostly shooting children playing and messing about full body - or head and shoulder shots. I'll grab some of the stuff I've been messing with, my photoshop makes up for any of the bad image I bring in, but I do want to learn and be a jack of all trades here...
Thanks for the replies guys, very helpful!! Im now ebaying and watching 50mm lens, I may buy one of them and a 70-200 as my boss is shelling out for me (he gave me 1k to buy a camera and I got the nikon d2x on ebay with a light gun) so I now have around £750 on a lens or lenses...