There have been over a million species of life identified so far in the world. And whether you view the originally introduced “kinds” as being represented by genera or species is hard to guess and will likely vary. It definitely is an awe inspiring thought of how all this engineering was accomplished in what to us seems a brief time span.
One thing that I will never do is suggest a model for such a process of design, engineering and introduction (I speak in human terms). To have seen the events as they took place would have no doubt caused me to fall on my face and cried out for mercy!!! The power of His Word was demonstrated clearly while He was here as Messiah Jesus of Nazareth. Jesus, though He was a man, He was always directly connected with His glory since He was without sin from birth. He was always able to reward faith in Him with healings and deliverance from demons and so forth. When Jesus was around the laws of physics went on hold at His will! It is clear that the Creator maintains the current “laws” of physics to provide humanity with a stable environment I suppose. He can alter those “laws” at any moment with His Word.
I cannot guess how the Creator accomplished His creation of His creatures, but I can be sure that it required an immense amount of planning, design, engineering, skill, wisdom, and above all love for all those that would emerge as living creatures on His planet.