Hi, welcome to the forum.
Hardly any CPs grow in normal soil substrate. The mixture you'll need does depend on the seeds you're trying to germinate. Sarracenia, for instance, grow well in a peat/perlite mix with maybe some sand. Peat-free mixtures are also available. They do, however, require a period of cold stratification in order to germinate successfully. Some drosera seeds won't need this cold treatment. If you tell us what you're trying to grow we can help you a bit more.