I usually use a saucer, a paper towel, and some saran wrap.
I fold the papertowel into 1/4ths so it fits the saucer, then put the seed/s inside and soak the towel with room temp water.
Then I place the saran wrap on top to keep it from drying out and place it on the top shelf in a closet where its dark.

I check it everyday and as soon as the root gets to about 1/8" or so, I plant it. Some strains take longer than others.
My haze took about 5 days, whereas my AK47 took only 24 hours.