I have information to contribute to the profile of John Scribner. This is what I can add:
These are the sources I am using:
Should I contact one of the pre-1700 projects or know about any style guidelines before proceeding? Thank you!
You might want to edit your question to indicate the information you are thinking might be added and the sources you have found.
For the English part of his life, the England Project has relevant guidance on reliable sourcing: https://www.wikitree.com/wiki/Space:England_Project_Reliable_Sources.
For the American part of his life, there is some guidance on reliable sourcing at https://www.wikitree.com/wiki/Space:United_States_Project_Reliable_Sources.