Make sure you know your zone and the flowers' zone. Planting can vary based on that too (although, you probably already got that part handled!)

I think the seeds are likely to call for being sown with something like ⅛"-½" of dirt above them so really would be in the dark until they sprout. (some seeds - like veggies in a garden - you poke a hole in the dirt and put the seed down in the hole, and brush dirt back into the hole; some seeds you scatter on top of the dirt and maybe lightly pat into the loose dirt or maybe scatter a little bit more dirt on top)

As has been mentioned, "full sun" or "full shade" would refer to the sunlight being blocked by something large like a tree or a building. If you have a yard (or neighborhood park) that is hit by sunlight most (usually 6+ hours) of the day, with no trees or buildings or walls casting shadows, that should work well for these seeds.

Also, with the rain you don't have to water them as much!