Hi and welcome Cyrus . I wish you good luck with your new comeback in to the hobby and this forum .
Your tank looks nice as a display tank in your living room .
I'm not too keen on using garden soil full of organics in discus tank , but with sufficient WCs I guess you'll be able to keep the water quallity in check . i would definitely go with adult discus in this planted set up instead of raising youngs . I would get the discus as a first fish , keep them for couple of months and then if all goes ok I would start adding other fish using proper QT procedure for introducing new additions .
What lights do you plan to use for planted tank ? It looks a bit too dim for a planted tank on this photo to me .
Good luck Cyrus and we eagerly await for discus photos.