The first day of creation: things we are never going to understand

Genesis 1:2 The earth was formless and empty. Darkness was on the surface of the deep and God’s Spirit was hovering over the surface of the waters. 3 God said, “Let there be light,” and there was light. 4 God saw the light, and saw that it was good. God divided the light from the darkness. 5 God called the light “day”, and the darkness he called “night”. There was evening and there was morning, the first day. (World English Bible, public domain)

There are plenty of possible questions about this passage, such as about how literally to take it, but I’d rather not explore the questions of what “day” means, and other such matters, important as they might be. I have some other questions in mind, questions that we will never understand in this life, and maybe not in the next one. We can, and may, have opinions about them, but the opinions are not strongly backed by the Scripture, or are not covered at all in the Bible, and Genesis 1 is interpreted in different ways by different people. For more on scriptural interpretation, see this post.

Questions:
If God spoke light into existence, what language did He use?
Does God, in this passage, mean God the Father, God the Son, God the Holy Spirit, or some combination of them?
Who did God speak to?
If He/They spoke to some other entity, who was it, and why was this said?
Did angels, or some other entity, actually create the light, at God’s command?
Was the creation of light preceded (whatever preceded  means to an eternal God!) by planning?
Was the entire electromagnetic spectrum, of which light is only a small part, created at once?
Did the creation of light cost God effort or resources of some sort?
Does this passage actually refer to the creation of the sun, or was that created later?
Was there light elsewhere in the universe, but not on earth, or, on the other hand, was the light created for the earth, or perhaps for the solar system, spread throughout the universe somehow, after this initial creation?
Was light created from something else?

Interesting questions. (There are more questions about origins in this post -- toward the end.) I have no answers. Thanks for reading.