Data sheets, with information on how to weld the materials, are available in the Stoody literature library at:
http://www.thermadyne.com/stdy/literature/nickel-electrodes.asp?div=stdy
"Stoodite" is Stoody's trademark for the stellite alloys. Just select the form (wire, rod or coated electrode) that you will be using and read the data sheet. If you have more specific questions, post them here and we'll try to help you.
HTH.