I have copper indoor planters and I am a complete Newbie so please be kind haha. I've done research but just want to confirm what I should be doing. It is also in a stand, so does not sit on the floor. So I should line it with plastic (are bin bags okay to use?); then I should put drainage in, I've read polystyrene is good; then topsoil, then plant, cover with more soil and press down soil, then water. Is that correct? Do I not need some drainage Holes?Thanks in advance!