God created angels
Angels come from God. Paul tells the Christians in Colossae that all things were created through Christ and for him, including things visible and invisible, and even heavenly ranks described as thrones, dominions, principalities, and powers (Colossians 1:16). Those words likely include angelic beings and show that they are part of creation, not rivals to God.
Nehemiah's prayer makes the same point in a simple, worshipful way. God made heaven, the highest heavens, and all their host, meaning the great company of beings associated with heaven (Nehemiah 9:6). Angels are impressive, but they are not eternal. God is their Maker.
For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
They appear before the world's beginning
The Bible does not tell us exactly when God created angels. In Job, however, God speaks of the earth's foundations being laid while the morning stars sang and the sons of God shouted for joy (Job 38:4-7). Many Christians understand the sons of God there to be angels. If so, angels were already present when God formed the earth.
That gives a broad answer without claiming more than Scripture says. Angels seem to have been created before or during the early work of creation, but the Bible's focus is not on a timetable. It points us instead to the wisdom and power of the One who made both heaven and earth.
Angels are servants, not people with wings
Scripture calls angels ministering spirits sent to serve those who will inherit salvation (Hebrews 1:14). At times they appear in human form, as visitors did to Abraham, but that does not mean they are dead people who have become angels (Genesis 18:1-2). The Bible treats angels and human beings as different parts of God's creation.
Their work can include delivering messages, guarding, worshipping God, and carrying out his commands. Yet their purpose is always tied to God. Psalm 103 pictures them as mighty servants who do his bidding and listen for his word (Psalm 103:20-21).
Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?
Created beings should not be worshipped
Because angels reflect something of heaven's glory, people can be tempted to give them too much attention. When John fell before an angel in Revelation, the angel stopped him and directed worship to God alone (Revelation 19:10). That response is telling. Even a holy angel is a fellow servant under God's authority.
So it is fine to be curious about angels, and the Bible says enough to inspire wonder. Still, the centre of the story is not angels. It is the Creator, Jesus Christ, through whom all things were made and for whom they exist (Colossians 1:16).
And I fell at his feet to worship him. And he said unto me, See thou do it not: I am thy fellowservant, and of thy brethren that have the testimony of Jesus: worship God: for the testimony of Jesus is the spirit of prophecy.