We are rural here and small pet shops can't survive, my options are a petco 35 miles away or my Wal-Mart.X 2 - no one starts out knowing it all- and it takes experience, trial and, yes, error to get it all down and even then you still have things that happen where you have losses, issues, learn new things, etc. I've been keeping fish for over 30 years and still have things happen now and then or have to learn something new.
One thing that can go a long way to help is to find a good Local Fish Store (LFS) - this is not your closest PetSmart/Petco, but an actual, honest to goodness fish store - a place staffed by folks with years of experience in fish keeping who share the passion you are developing - folks who are only too happy to share their knowledge and experience with newcomers to the hobby. A good fish store/fish mentor is worth it's weight in gold!