I've done a little research, but I'd like to know more on a few different things.

1) How do I set up a drainage area for a vivarium with a waterfall and eggcrate for false bottom? I've watched a lot of videos on waterfall setups, but I just can't quite figure out how, in my situation, I'm going to be able to do what I want to do. Essentially, I want to have water fall from the back wall and either immediately go through a "substrate" of rocks that is separated somehow from the other substrate so dirt can't get in that water easily, or go down a stream on the ground that is just underground pond-liner filled with rocks into the same sort of "rock substrate". (I can elaborate if this doesn't make sense.) How do I separate the rock area from the regular substrate area without making it obvious that something artificial is being used?

2) Is there an exact list of do's and don't's for vegetation inside a bio-active vivarium? I want to incorporate moss and some terrarium-type plants, but I know little more about the way such things interact with BPs than "pothos is toxic" and "BPs tend to trample grounded plants." Is there a quarantine process for plants to be used in a vivarium, or will alcohol spray take care of it? Which mosses can be used, if any? Is most planting soil okay for BPs, or should I stick to something gold-standard like ABG mix? What, if any, are the better plants to use with BPs, both as far as the snake's well-being and the plant's well-being? And is there any problem with using springtails and isopods in a BP's vivarium?

Thanks for your consideration. I am very much still in the learning process and want to know what to do and what not to do.