I would suggest that you just start filling in family for John, and you may ultimately run into leads as to who his parents were.
It's like a big jigsaw puzzle. :-)
Take a few minutes to go read that help page, though, and you'll start to get some ideas on how to proceed.
Normally, we suggest that you start by filling in your immediate family members -- parents, grandparents, etc. -- and then you start searching for records based on their names, birthdates, and locations. By sourcing your more immediate relatives, you'll begin to discover other relatives and other branches, and you can work your way backward in time.
Also, start playing around with all the options on the FamilySearch page I gave you. If you scroll down that list and look on the left-hand side, you'll see some options you can play with, e.g., birthplace, residence, etc.
You can filter the records based on those options.
Just spend some time getting comfortable with sorting through those records and learning how to use their website. You can uncover a great deal about your family by using their record collections.
This is really exciting, Nicholas! There are so many records for you to get started with. :-)
I have to step away before I fall in this rabbit hole with you!! haha