Hi Vicky
Best advice is read the manual and familiarise yourself with your new camera (excellent choice in my opinion) then go out and take some pictures.
P mode is a decent start rather than full auto, get to change some settings and you can then see what difference things like aperture and shutter speed make
Most of all enjoy it and don't worry too much, it all falls into place over time and remember its meant to be fun that's why you spent all that money.