Burmannii:
http://www.growsundews.com/sundews/burmannii.html (scroll down for "propagation techniques" for growing from seed) - if kept in tropical conditions like a terrarium or idoor grow rack, burmannii can lives for years (and flower multiple times) even though they're annuals in nature that die after setting seed. Burmannii are my favorite sundew.
Indica: Germinate indica seeds the same way as burmannii, but sow on soil with much more sand, like 70/30 sand/peat for example. Indica also prefer drier than wetter soil (not unlike flytraps). They won't do well long-term if kept too wet. They will germinate fine with wet soil and the seedlings will grow fine in mid-to-wet/damp soil, but as they grow up, soil needs to be kept "just damp". Also, they're not like burmannii where they can keep on growing after flowering as long as conditions remain tropical - indica are
strict annuals, which means that if you don't collect seed when they flower, you'll lose all your indica because they all die after setting seed. Here's a little specific info from ICPS:
http://www.carnivorousplants.org/seedba ... indica.htm
With both burmannii and indica, it's important to feed them even as seedlings so they grow up fast enough. If you never feed indica, for example, you may have trouble getting seed before they die. While they're so tiny, I sprinkled crushed freeze-dried bloodworms over them (it's almost like a dust). You can get freeze-dried bloodworms at any major pet store; I think it's in the fish food section. They come whole, but you just twist them in your fingers into a dust, then sprinkle that dust all over your seedlings. Some will get more food than others, but indica get so big (somewhere around 24 inches tall I think?) that you'll only want a few or so of them by the end of the year anyway. I started with about 30 of them, and as they grew, I plucked out and tossed the weaklings that weren't growing as fast. Burmannii only get a couple cm in diameter (about the size of a US quarter or so), but I had a lot of them as well and plucked/tossed the weaklings as well as they grew.
Gemmae/roseana: I don't know much about drosera gemmae, but this site seems to have quite a bit on general care as well as seed germination guide all on one page:
http://www.droseragemmae.com/CareGuide.html (be patient with the link; may take a minute to load).