Step 1; get pots! Or anything that can have holes punched in the bottom and be filled with dirt.
Step 2; get potting soil! The cheap stuff is fine. Pick up some earthworm castings too.
Step 3; choose plants! Plants should come with tags describing how big they’ll get and what kind of care they need.
Step 4; pot up plants! Throw a couple handfuls of worm castings in with the potting soil.
Step 4; water according to tag instructions. Throw some more worm castings in there every few months. Make sure they get appropriate light. The plants’ll do the rest.
As for the greek gods; any Hellenic followers here feel free to chime in! I’ve not had much experience with the Hellenic gods.
As for the Fae; I don’t work with them. I go to some pains involving cold iron to keep them AWAY. So, that I can’t help with.