Who maketh His angels spirits; His ministers a flaming fire. Psalm 104:4.
These angels in serving God serve His people, as well (Heb. 1:14).
Who laid the foundations of the earth, that it should not be removed for ever. Psalm 104:5.
The angels were created before the creation of the earth as seen in the following verses:
Where wast thou when I laid the foundations of the earth? declare, if thou hast understanding. Who hath laid the measures thereof, if thou knowest? or who hath stretched the line upon it? Whereupon are the foundations thereof fastened? or who laid the corner stone thereof, when the morning stars sang together, and all the sons of God shouted for joy? Job 38:4-7.
(In the Old Testament “the sons of God” are angels.)
Satan
Satan was in the highest position among the angels and the most intelligent. In the following, God speaks of Satan’s place and his fall in symbolic language.
Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created. Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire. Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee. By the multitude of thy merchandise they have filled the midst of thee with violence, and thou hast sinned: therefore I will cast thee as profane out of the mountain of God: and I will destroy thee, O covering cherub, from the midst of the stones of fire. Thine heart was lifted up because of thy beauty; thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground, I will lay thee before kings, that they may behold thee. Ezek. 28:13-17.