You've got most of it down. My process goes something like the following:
- 1)Mix and hydrate soil — I use 1:1 peat perlite
- 2) Fill growing container to just below the top, lightly packing the soil down
- 3)Evenly sprinkle seeds over the surface of the soil
- 4)Lightly mist the surface to help settle seeds and place in growing environment
I grow most of my plants in an enclosed space in a tray with T8 lighting which keeps humidity at 65-70% and temperature around 80°F when the lights are on (12 hour photoperiod). That being said I don't bother to enclose my seeds with a bag, whether or not you do so yourself will depend upon your growing environment.
As for keeping the seeds cold, some do have to be cold stratified before being seeded. However D. capensis does not need this and will appreciate it if you can keep them on the warmer side. I don't know where you live but I assume it is winter there which means you will want to place your plants on a sunny windowsill in a bag (make sure if you do this that the seeds don't get cooked) or under growlights if you have them.
This is certainly not the only path to success, merely my way of doing things. Capensis is very easy to grow and should be a good place to get your feet wet in the world of growing from seed, enjoy the process!
Why are there no carnivorous plants native to the desert??
My grow list