When you receive the cutting (which is usually in a plastic tube, with agar around the roots), wash off the agar completely with light, lukewarm water. Plant it in your soil medium (or better yet, peat or rockwool), and make sure your soil is moist. Keep it in a humidity tent (either a plastic cup or bag, over the soil and the plant) for a while, until the plant starts to perk up a lot, and shows signs of growth. Keep an ample amount of light on it.
Wean it off of the humidity tent slowly, removing it for just an hour or two a day initially, and then more as time goes on. If you immediately remove the humid environment the plant rooted itself in, then it will die, or at the very least experience a host of other troublesome problems.
Then you just grow the plant, taking care of it. Trim off the foliage at the nodes, preferrably at a 45 degree angle, and air dry it. Or you can fortify the leaves with an extract if you collected an ample amount. Just keep the plant alive and vegetative, and new shoots will emerge from where you trimmed off the foliage. The plant can be picky, but if you pay attention to it, it should be fine.
~Ethno