Sounds like you have started a new aditction...
You seem to have read up on a hole deal, and youre plan looks nice.
Only i would not tuck the air-roots into the medium, they are not used to that conditions, and will most probably rot if you do so.
Just give them a light mist every morning instead, that will do the trick!
Phals are not the most humidity needy chids, as long as you are doing what you plan to, and maybe put the chids together, with other plants as well, i dont think humidity will be a big issue.
They are not the most needy about direct light either, and you should be carefull with the sun. To mutch will cause burning pretty fast.
Phals wants good light, but not direct sun.
When you fertilize, remember to flush with plain water from time to time as well, to prevent too mutch salt building up in the medium.
The other thing you should remember, is to buy pot with dreinage. That is important, as the phals like it moist but airy, and never wet.
Clear pot is good, both for the plant s chids are able to photosynteize using the roots, and for you to keep a closer eye on the condition to the plant.
Before you repot, let the medium stay over night(some prefers 24 hours) in water to become moist.
And let the chid stay in water for an houre or so, before removing the old medium. This will make is easyer on the roots.
There are planty of people with mucth knoledge about fertilizing and other growing products here, i can not adwise you on about that.
Good luck! And keep us posted!