Dieu wrote ...
You should look for HV trasf. Its power wiil be decide for final effect. Output voltage of HV tranf. should be around 5-30kV.
Of course you need some teory, some from internet, youtube, maybe book.
Tesla Coil Designer may be help for calculate everything.
Here is many ways to make TC and in every country is grup of pepole who doing it together, helping eath other.
You may ask your friends, I bet some of them was trying, or hearing about doing it.
Here TCD link :
I downloaded it but it couldn't run!