Apple 1st generation pencil
Can the 1st generation pencil be used with notes on iPad and convert to text?
iPad Pro 11-inch Wi-Fi
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Yes (like 2nd generation Apple Pencil) it can, if it's compatible with your iPad (seeing your product list, it looks like you have an iPad Pro 11", so it supports Apple Pencil 2nd generation only).
See this compatbility list:--> Apple Pencil compatibility - Apple Support
As far as Scribble (convert to text) is concerned, take a look at this support page:--> Enter text with Scribble on iPad – Apple Support (UK)
Regards
Giulio