Sow seeds on the surface of a regular peat soil mix, they need light to germinate. Put the container wherever you normally grow sundews. Some people will recommend elevating the humidity by putting a clear cover over the container, though I generally don't. If you do, don't leave it in direct sun as it will heat up far too much.
As for where to get seeds, it's usually easiest to buy some from other growers. People often sell seeds from their plants, most often on Facebook.