Please remeber this, first of all: your altar is never "empty." A pure and sacred space will always be Divinely Blessed. I'm reasonably sure many will agree that we have all seen cluttered spaces claiming to be altars that are only for human eyes with no more sincere spiritual devotion than a pile of rubbish.
Your altar may always evolve. If you have needs for it, be assured they will be provided.
Trust that the inward grownings of the soul are always heard, and visualizations are part of this. Words, spoken aloud or not, may accompany these beseachings. As I understand, throughout my life, all my Gods provide generously. We do, though, have to recognize Their gifts and be willing to embrace them. I spend far more of my moments today giving thanks for unasked for gifts than I would have ever believed.
Remain patient, Catherine! The first things that we think we need are rarely the needs that They see. Trust that you will be cared for fully!