I'm new to growing figs. But I also use a method very similar to that given by Steve with what I think is good success. Once the cuttings show roots and leaves, I water them with a weak fertilizer solution every time that I water. Then I switch to mostly bottom watering, and feeding with MG, once I up-pot them and move them outdoors. When up-potting, I also use a very well draining soil enriched with fertilizer and micro-nutrients. I place the small trees in large flat 4'x4' trays that I found at HD. I use a variety of grow bags, root pouches, and some pots (I am still testing).
The trees that I start like this are MUCH healthier than the ones from cuttings that I rooted directly in soil or pots. I have trees that started as cuttings in moss 3 1/2 months ago that are now around 4 feet tall. Very health, well structured with branches (I pinch the top of the whip at about 2 1/2 to 3 feet to encourage this), and would be covered in little figs if I did not keep pinching them off.
CliffH