I am relatively new to growing, and have yet to clone, planning on it- but I have done extensive research on this site and others, my understanding is that you cut the whole branch above the 2nd or third node... So you have to wait until your plant is tall enough/has enough shoots to do it- or it will stress it. You cut the whole limb, and then you can remove the off shoots of that limb if you prefer- leaving only a couple of leafs on it- this concentrates the energy on forming roots- rather than growing leaves. You can also cut half the leaves off- so they dont come to a point- cut them like half way- it will look like a goofy octagon leaf- this will keep the water from being wasted by going to the tips of the plants.
Clones are demanding though. They need between 95% and 100% humidity- they must be constantly sprayed down in their ventilated dome- because they dont have roots, they dont take water through the soil.
One tip and trick about cutting is, cut at a 45% angle- increases surface area for the rooting hormone to stimulate root growth, and also cut notches into the stem where it will be placed in dirt- these notches will increase surface area as well-. Also the grow medium- be it hydro or soil, needs to be warmer than the air to encourage the roots to spread into the soil or medium. This warming of the grow medium can be accomplished by simply putting a heated blanket under the soil or pots. Another way is to build a separate box with light bulb inside to heat the bottom of the plants- but i have heard good things bout the electric blanket.
Best of luck- hope my newb to newb advice helps.