1). Any susbtrate u want
2). Java fern, hornwort, java moss, moss balls, anubias and cabomba and maybe pearlgrass and water sprite & wisteria. I probably missed some bc i no remember lols
3). Betta or guppies. Am gonna order my sparkling gouramies to start with them after losing my 5 betta. I would really recommend them, they r perfect nano fish and when they make noises, they can b heard across the room.
before putting in any live stock in, u may want 2 do the nitrogen cycle.
Other more experienced members will explain.
T
TwoTankAmin
is great, he can help as well