I find landscapes some of the hardest things to draw so you you have picked an admirable goal! A good tip for starting out is to create a landscape using bits and pieces from a collection of base images. So after a while you will be able to just draw them out like it was nothing XD. Sorry if that was insulting your intelligence, I'm not sure how much practice you've had!
Well just invest a little tome and you'll be surprised how soon you pick up new skills and before you know it, you will be drawing stuff three times better than you ever thought you could . I look forward to seeing your future work!