@GermanB  check out training at https://proconnect.intuit.com/training/software-webinars/  and https://www.cpaacademy.org/archived_show/a0D2S00000i1X5iUAE

along with many other Schedule C training courses out there. Get started now!!!  You will need PTIN hours, so do them in what you are weak on.  

When I started we used two Publications 17 and 334

I would even suggest you get actual paper copies to have by your side  https://www.irs.gov/forms-pubs/forms-and-publications-by-us-mail