Potato flake starter - need help with maybe converting

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Hi I have a potato flake starter that I love for soft bread and cinnamon rolls - BUT I would love to see if I can make some good sourdough bread as well. 
is there anyway I can convert some of the potato flake starter? I’m so new at this would love some help :)

thanks 

I didn't read the below, but just combine with a 50/50 mix of flour and water and wait - a couple weeks should be enough. Enjoy!