JD is right matie..
But, I had a 70-300mm lens that did the job to an extent in my early days, and it cost me £ off ebay, I had it 4 years and have just sold it on ebay for £70..
So many people focus on the camera rather than the lens..work up to the best lens that you can afford, it will make all the difference to your photography.
My main lens is a Nikon 300mm f4, and 90% of the time with a 1.4tc fitted..I only do wildlife though, not landscapes.
Happy snappin