These threads should give you some ideas on planting seeds. But, I must ask...what kind of seeds are you planting? My main interest is in sundews but have started a few flytraps and have some small purple flytraps I'm trying to "grow up" (thanks MikeB!!!). So, I can't say much about growing flytraps from seed.
With sundews you definitely want a *very* humid environment for germination and then a pretty high humidity level until the seedlings get a little size on them. Some sundews require stratification, lots don't. A 1;1 peat moss to perlite mix is usually recommended...but there are other ratios and a coarse sand is used for some mixes....some sundews do well in most any kind of growing medium while other sundews do better in a more sandy mix...or maybe one with more perlite...or more peat moss. It varies.
Naturally only use rain water or distilled water. I prefer distilled water for germination so that you don't introduce mold or algae spores that might grow faster than the tiny seedlings. Once the seedlings get a little size on them I go to rain water.
Here's a few threads that you might can glean some info from...
A thread on some containers: CUPS, TRAYS, BAGS, AND OTHER "WHAT-HAVE-YOU" CONTAINERS<GRIN>...
This question was for planting sundews. Flytraps can probably start out in 3-4 inch deep pots but will need to go to 6" or deeper ones as they mature. Sundews apparently can handle shallower containers... ARE THESE PLANTERS TOO SHALLOW?
My own deer-in-the-headlights seed planting thread... JUST GOT TWO ENVELOPES OF SEEDS...NOW I'M FREAKIN'OUT!!!!!!!!!
Hope some of that helps!!!