Keep in mind that the shallower (is that even a word?) that you plant them the more chance you have of the seedling emerging with the seed cap or helmet stil on. Planting a little deeper (say min 6mm) has the advantage of removing the cap before the seedling pops it's head up.
The way i raise them as youngsters is to use cheap ass plastic drinking cups after i have started them in jiffy pellets.
You get a stack of say 10 cups and heat up a thin screwdriver until it's just red (use a blowtorch, stove top, whatever). Then get your stack of cups and turn them upside down and push the screwdriver through the bottom of the stack of cups, i usually do this about 5 times so there are holes all the way through the stack, in the shape of a cross with a hole in the middle. You can do them seperately but it takes longer.
After the seed shows a hook it is moved into a cup with your choice of potting mix and bottom watered. Some people choose to remove the netting from the jiffy pellets to allow the roots to grow easier. You just fill up a larger cup with about 50mm of water and place the plastic cup in there so it can soak up the water. Then they are put under CFL until they are ready to be potted up at a later date.
Bottom watering has the benefit of coercing the roots to travel downwards in search of water instead of staying shallow up the top of the cup, making the root mass at plant out a lot stronger and ready to take on the world.
