I was looking at Genesis 1:2 the other day and I was wondering if I understood it correctly was the earth unformed and unfilled and covered (surrounded) by water and darkness?
That seems to be right. Genesis 1:2 reads: “Now the earth was tohu vavohu and darkness was upon the face of the tehom and the ruach elohim hovered over the face of the waters.”
No one knows seems to know what tohu vavohu means, but it denotes unformed or unfashioned matter. It seems that it is denoting that the world was unformed before creation as if G-d used pre-existing matter to form the world. The word tehom is usually translated as “deep.” The phrase ruach elohim is usually translated as “the spirit of G-d,” but ruach means “wind.” It is saying that a “a strong wind,” blew across a deep. The basic meaning of elohim is "powerful." G-d is called Elohim (in the plural) because G-d is more powerful than anything else.