Genesis is so rich and so necessary to understand for a foundation to be built on truth, to be assigned the responsibility of teaching it is both a blessing and an undertaking.
Just verses 1: 26,27 reveal God's plan for man and establish the perimeters that all Biblical doctrine must be able to fit within.
God is a spirit with a soul and He created man to have a spirit with a soul thus man was created in the image of God. In verse 27 God gives us an example of what all truth in the Bible is based upon the foundation of two (or more) witnesses when He said twice in one verse that he had created man in His image.
However in verse 26 God said "let us make make man in our image AND after our likeness' ......... first off who is the "us"?
God is a sevenfold spirit who gives and takes council in Himself and from no other source......... Isaiah understood that and listed all seven spirits of God for us.
Isaiah 11:2 And the spirit of the LORD shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and of the fear of the LORD;
Now that makes it easy to see what God meant when He said that man had become as "one of us". When Adam sinned it was because he took council within himself instead of remaining obedient to God who said to Adam "Thou shalt not eat of the tree of knowledge". That has been mans problem ever since then as man continues to prefer to take council from his own mind/soul rather than be obedient to God......... thus the spirit of council is the "one of us" that Adam became.
However God's Word will not return void and man will not be just in God's image but will be in both God's Image and His Likeness that is to say man with the spirit and soul of God....... and towards that end all doctrine must fall or it is not from God.
So while on one hand we set the format that all of the Bible is to point to we have only begun to scratch the surface of Genesis.
For sure you are going to have to draw very close to God and have ears that hear in order to teach Genesis as God would have you to teach it........ but it is a wonderful opportunity to please God and at the same time help His children
Blessings
Doug