The first heaven is the earth’s atmosphere; the immediate sky. It is where birds and clouds are. It is the heaven referred to in the Bible verses below. Deut 11:17 And then the LORD’s wrath be kindled against you, and he shut up the heaven, that there be no rain, and that the land yield not her fruit
Paul spoke of the 3 rd heaven, presumably therefore there must be 1 st and 2 nd heaven: 2 Cor. 12:2 "I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;) such an one caught up to the third heaven ." Heaven is the "dwelling place" of God.
The FIRST HEAVEN as "dwelling place" of God is confirmed in: 1 Cor. 3:16 "Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you?" It is a state in the sense God alludes to it, and this should be found in the real believers.
The third heaven is the dwelling place of God. Matt 5:16 Let your light so shine before men that they may see your good works, and glorify your Father who is in heaven The third heaven is also referred to as heaven of heavens.