I use 5-8" diameter oak (there are other types that can be used) logs that I cut into 4' lengths, usually in the early spring (February-March). I paint the ends of the logs to keep other fungal spores from colonizing them, rick the logs up and let them rest for a few weeks. When the weather warms, I order dowels inoculated with Shitake from Fungi Perfecta (there are other places), let the dowels rest a week or so in the fridge, drill holes in the logs and pound the dowels in. Sometimes I seal over the top of the dowels with wax.
Then let them grow for 6 months to a year and they begin to produce. For me, the logs produce 5-6 years. This year I also have Oyster mushrooms. They need a really shady, damp spot. This is where the figs come in. When I dump a bucket of water on the logs, some runs off for the fig tree.