Congrats on your purchase! Now the fun starts. Some advice:
- Get yourself out of the fully automatic mode as soon as you can. The point of an SLR is control. If you bought it to get 'the best camera possible' you should have gone with a point and shoot camera, which would have served you better. SLR photography is all about control.
- Take lots of pictures. Take the camera everywhere. Shoot everything anything of interest, pets, furniture, your yard, your E90. Manipulate the controls and check the results on the photo.
- Get yourself a book. I got this one and found it was really good on the basics.
http://www.amazon.com/Sammons-Comple...e=UTF8&s=books
- Talk to as many people as you can about photography. You will be surprised how many people have this as a hobby and can help you learn.