If you have been created to rule, you need to know the one who created you to rule; you need to know what He's like, and how he would do stuff. How can you represent someone you don't know? If you don't know Him, you won't know how He would deal with stuff; you would just come up with your own ideas, which is what people do. Clearly then, God has chosen man to represent Him. If we're going to rule over whatever sphere God's given us, then we need to know what God is like, how He would operate, and we need to know the rules and principles of His kingdom. They're all found in the Bible. You want to read and study the Bible, and find out how God operates.
For example, when God formed the nation Israel, the first thing he did was to give Moses 10 commandments; and the 10 commandments are divided up into two groups: how to relate to God; and how to relate to people. They were to form the foundation of a nation, and a culture - heaven on the earth. Once you start to see it, you see how all of these things in the Bible come together, and how God has displayed in it little by little all through the Bible.
Only someone specially made for this purpose could do the job. Only someone specially made, or specially created, could do the job. Why didn't he get angels to do it? Well, the Bible says that angels are just servants. Angels do not carry the nature of God. They are very powerful beings, but they don't carry the nature of God. There's only one part of creation that actually carries the nature character of God, and that is man. Any man can be the representative.
Genesis 1:26 - "Let us make man in our image according to our likeness, let them have Dominion."
God's thinking was not just of one man in charge of everything; he's thinking of people, in charge over God's creation, delegated something to do.
Genesis 1:27 - "God created man in his image, the image of God, he created a male and female. He created them."
When God created man, he created them male and female; so male and female together represent the nature and the character of God. His intention was they would work together. They would not be competitive. Competitiveness came in after the fall. Unity was what was characterized before the fall.
Man is created, and he created us in our image, meaning His image. He created us to be to resemble him, or to represent Him. 'In his likeness' means to be a similar form, or to be closely representing him.
How was man to be the representative of God? Very simple, God created man to be a spirit being. God is a spirit. You are a spirit. Birds produce birds; cats produce cats; dogs produce dogs; and God, a spirit, produces spirit beings. He's called the Father of Spirits. You are a spirit being. There's a uniqueness about you; a spirit being, dwelling in a body, with soul and emotions, able to make decisions. That's who we are. We're created as a spirit being, able to connect with God, because we are spirit like him - connecting spirit to spirit. We are created for an assignment on the earth, and we are created to represent God - that's what the design is. Sin is what's wrecked it all.
God has created us to be sons. When we use the word son, we're not using a gender term, it's just a pattern. Father and a son have a function in the Bible. When he's using the term son, he's including men and women; he called their name Adam. They, the man he created, was made up of male and female; so you don't distinguish when we use the word son. We're not referring to gender, man or woman; we're referring to the people God has created.
Here's the thing, there is a difference between a servant and a son. Here's two differences:
1) A servant just fulfills the tasks that are given to him. He just does the jobs that he's told to do. That's a servant.
2) A servant does not have any inheritance in the house.
The son is really quite different. The servant is concerned about getting the task done; but a son is the heir of the of the house. If you're part of a family, then there's probably some inheritance of some kind. If the parents have been Godly, they will have built some inheritance, financially or otherwise. When the parents pass on, then there's an inheritance. If you are investing in that inheritance, it's something you eventually going to have yourself. A son then knows that whatever he works with his father to build, he will be owning later on. There's a huge difference right there.