I see you have had no answers to your post yet. I am not surprised, because you are asking what is discussed in rather thick text books! Can I suggest that you have a look through some of the old posts about TIG power sources and work from there.

When you decide what power source to purchase, the supplier will also be able to help you select the right accessories for your job. Again, some of the old posts contain information regarding this.

Once you get to the actual welding, then ask more specific questions regarding problems you are experiencing.

Hope this helps

Regards
Niekie Jooste