Hi there,
As Andrew pointed out, drosera capensis can easily be done using leaf cuttings, but if you want to try seed this is how:
Take some unbleached coffee filters or some filter paper and make a seed packet. Place some seed in this and put it in a sterile bleach solution (10-20% bleach, the rest sterile water) for about two minutes, making sure all the air pockets escape so the seeds all get immersed. Then place the packet in some sterile water to rinse off the bleach, open the packet, and use very precise tweesers to remove the seeds and place them in the cultures. The small size of drosera seeds makes them hard to work with but with square-tipped tweezers it can be done.
Vft seeds are done the same way but left in the bleach solution 5-10 minutes. Sarra seeds are really hard to sterilize, but after stratification or a soaking in GA3 you will want to dip them in rubbing alcohol and then sterilize them in the bleach solution for at least 10-20 minutes. THey are very rough surfaced and so are hard to sterilize.
Hope this helps.
-noah