You could plant 1 but it might get lonely so you should probably plant 2 but just to be safe incase of any issues or problems so like I was saying 4 would be ok but it’s always good to plant a prime number of seeds to be safe.
As far as suggestions just don’t plant it in miracle gro or anything with time release nutrients in it.
Dont fall for the over priced fertilizers. Make sure it has micro and macro nutrients.
I use Jacks it’s cheap but good General Hydroponics or Fox Farms are good too.
The light is really important but for 1 or 2 plants you can pick something up for $65 to $120
Your so lucky , got to try some as a MCT oil tinture once was blown away . Took away all my stress , felt normal again for once in my life for a whole week, is definitely number 1 on my list now.