Soak the seed over night.
You can start them indoors about 3 to 4 weeks before the last expected frost or plant them outside after all danger of frost has passed.
You can use a potting medium and any container that has drainage.
They germinate easily.

Hey girl. Hope things are going well for you? I don't have any trouble getting moonflower seeds to sprout. Infact they just come up by themselves. As Terramadre say they germanate real easy.

I just planted directly and watched them come up and grow.