I've always germinated seeds directly in potting mix. Most recently I had 1 out of 14 seeds not germinate and they were verging on a few years old. They still came up in about 3-4 days.
Fresh seeds just sow directly into whatever media you plan to grow in. The depth of the media should be at least 4", because that's about how much the taproot is going to protrude shortly after sprouting. Smaller containers will also dry out quicker depending on conditions. Pre-moisten the media, make a hole about half an inch deep. If you use your finger that should be not quite to your first knuckle (depending on the size of your hand). Don't bother trying to orient the seed in any particular fashion. Not only is it likely to shift, be cannabis seeds actually germinate in such a way that they will orient themselves while shedding their seed casing. Just water thoroughly and put them somewhere warm. Drain any run-off remaining in the tray after about ten minutes or so (don't leave containers sitting in stagnant water).
Do not use a dome. Using a dome could lead to damping off which is an infection that can kill the seed before or shortly after it germinates. This is more likely if the temperature is too cool.
Do not soak your seeds. Unless perhaps they're old stock (over a couple years old), in which case the embryo might have dried out a tad and soaking
briefly may be beneficial.
Warmth is probably the single greatest factor, though. Ideal temperature is above 70 F, lower 80's is fine and should speed germination. If the environment is cool, either use a heat mat and/or keep lighting on from the start. A T5 fixture for example just a few inches from the soil surface should warm it up.
This guide is more comprehensive, and Mandala seeds are the shit:
http://www.mandalaseeds.com/Guides/Germination-Guide
