Isaiah 6 - Isaiah's Vision and Call

A few things that interest me are:
1. The vision of Jesus as the future king-priest Isaiah 6:1, Numbers 14:21, Psalm 8.
2. Did Isaiah prophesy ch.1-5 before his call in Isaiah 6? My tentative answer - yes.
3. The significance of the seraphim Isaiah 6:2. Are the seraphim also fulfilled by Christ? - my tentative answer - yes, as the cherubim of the Most Holy Place and Ezekiel 1 are fulfilled in Christ. Also, what is the meaning of their wings, and in what way are the seraphim different to cherubim, etc.
4. NT allusions to Isaiah 6, eg Matthew 13, John 12, ie some aspects of the fulfilment of Isaiah 6 in Christ's ministry.
5. The enigmatic summary of Isaiah's and Christ's preaching in Isaiah 6:9-10, quoted in Matthew 13, John 12, Acts 28 compared with the simplicity, beauty, strength of their preaching, and the effectiveness of their preaching amongst their disciples.
6. The greatness, not only of Isaiah, but the book and words of Isaiah, the "5th gospel", the greatest of the writing prophets.

My tentative answer to item 2
2. Did Isaiah prophesy ch.1-5 before his call in Isaiah 6?
Yes. Isaiah was given the vision of the kingdom in Isaiah 2 and also of the earthquake. This prophecy appears to be before the earthquake during Uzziah's reign Zechariah 14:5, which I assume was some years before Uzziah's death. The book of Isaiah appears to be sequential. Isaiah having commenced his work as a prophet during Uzziah's reign, appears to be called to a greater role, being given a vision of the Most Holy, and being humbled and cleansed. As a result he also assumed the role vacated by Zechariah the prophet to Uzziah in his earlier years. Isaiah is revealed as the prophet to the king, perhaps Jotham, but especially Ahaz and Hezekiah.

Any suggestions would be appreciated.

Kind regards
Trevor