what are good third part template companies ? also can i use any premade templates from anywhere ?
I don't believe we can self-promote in here but try the Duda Experts page to see which ones provide templates. There is a services filter on the left for 'Template Creation'.
You can also Google search for something like 'duda templates' and you will see other Duda agencies who offer templates for sale. If I can help any further, please send me a DM.