Repotting my Phal orchid

[mrystntn]

This is the first time that I am repotting my Phal orchid. Right now it is stil in the small clay pot from store. It has bloomed and all the flowers and leaves fell off. I also trimmed the main part per the directions. I purchased a larger basket for it and also some spagmoss and a special mix of coconut coir, fir bark, hydroton, and sponge rock. What is my next step? Do I have to trim the roots? Also should I use both of those with my Phal? Any help would be very appreciated as I am very much a novice at this. Thank you.