I have 2 tips for you:
1.) Remember to keep your zoom lens to a moderate length. Keeping your zoom lens a moderate length will enable you to hand hold the camera to get the shot and will enable you to stabilize your camera for sharp images and you won't have to carry a tripod around with you all the time. Choose between a 17-55, 18-70 or 18-105 to start with.
2.) Another feature to look for in a zoom is VR (Nikon). VR stands for Vibration Reduction. This built-in feature will help to stabilize your lens when shooting.
I hope these help.
Until next time.
Why Carry a Zoom Lens? from Nikon