I would like to buy a bino telescope/telescope binocular?

i'm a beginner in astronomy but have been star gazing(naked eyes of course)for some time now. i would like to move on and buy a bino telescope but dont know which is good. my requirement is to see the moon surface(craters etc) and simply bring the stars closer, be able to see saturn's ring. i dont know if it's possible to do so with a bino telescope(i know i'm not ready for real telescope yet). i learnt that for example i have to choose a BaK4 lens...is that true? and the "15x 70" thing, 15 stands for magnification and 70 stands for aperture, is bigger aperture and magnification better? what about zooming feature?