Most have at least a few things in common: their trapping mechanism (dew), and their ease of propagation. That said, to get this to work for you, find one that will grow in your area, as "dews are found all over the world.
Most of the more common drosera are easily propagated by seed. Some, such as capensis, can self propagate to such an extent that it becomes a weed in carnivorous plant collections! To get seeds, first you need a flower. They range in color from white, to red, to purple, with all the colors in between. If you wish to ensure a good seed set, you must cross pollinate your dews. That means you need two separate plants flowering at the same time, and you pollinate each of them with the others" pollen. The simplest way to do this is to simply take the flowers and rub them together. It works, but the results are sporadic and hard to guarantee. I prefer to get a fine point paint brush, take the pollen (the yellow-orange stuff near the center of the flower) and rub it on each stigma (the white-ish color thing next to the pollen in the center of the flower). If you do it right, the petals will shrivel, the base will swell and brown, and in a few weeks to a month, it will open, revealing tons of near microscopic seeds.
To germinate the seeds research where your dew is from. Tropical seeds require no cold period, and can be planted on your favorite carnivorous plant mix (50:50 peat/perlite or 50:50 peat/sand if you don't have one). Give them good light, and humidity between 40% and 80%. Temperate ones on the other hand require a stratification (four weeks in a plastic baggie in the fridge), and then follow the above.
Now for my favorite type of propagation! Leaf pullings!
To take a leaf pulling, gently yank a leaf of your beloved sundew. You need some of that white-ish base at the bottom for a successful pulling. First off, take the pulling, and lay it in a pot. Burry the white-ish base but nothing else. Cover with some sort of high humidity thing, like a plastic bag…or a terrarium. If you do it right, in a week or two, new plantlets will start growing from the leaf! It's really cool! They are genetic clones of the plant you took it off of, so congrats on cloning! You can also do this with roots, just burry the root and wait.
There are also ways to propagate tuberous drosera via tubers, but if your reading this, I doubt you need help with your rare tuberous drosera, eh?
