Learning, at least for me, is difficult during tax season.  I think you should start with the 1120S instructions. Or the Spidell guide here:  https://www.caltax.com/shop/publications/books-and-other-publications/life-cycle-of-a-corporation/

I like to learn from actual teachers but to each his own.

Consider this if you want more time:  File an extension for the S corp, estimate the income that will flow to the 1040, then file an extension for the 1040.