Do a google search and you will find many good references.

Why not? If you have time and the money, go for it. You may not understand everything from start, but you learn while doing it.

Sure you can buy all kind of kit and assemble one for fun. But none will be as good as you wanted, all have some sort of defect. They are made not just for the sake of helicopter, but as commodity to be sold to as many as possible for profit.

"main Rotor -to- Tail Rotor rotaion Ratio" Is that really so important? There are many ways to fly the machine vertically and keep it in stable hover and most without the benefit of a tail rotor. The Lama is a good example.

I wished I had time and resource to experiment with my own heli design, but am having too many other things to do.