The first schooling all children get is homeschooling. Depending on where you live and the way the parent(s) employment is arranged, they might have no teacher other than a parent for 6 weeks, a year, 4 years or more. The majority of children then go on to get some teaching from a trained professional (daycare worker, nursery school teacher, primary school teacher) for as long as 6 hours a day or more, while still learning more informally from their parents. Until about the second year of fulltime formal schooling (say age 7 or 8 in most countries) they learn more from their parents - how to eat, dress, care for themselves, vocabulary, and even reading - than from the other teachers.
Setting aside my understanding of homeschooling to be acting as your child's only teacher past an age where most children have multiple teachers, it seems you are asking about those early months and years, what some people would call preparation for traditional school. Almost every "baby book" you can buy is crammed with advice on how to teach your child to eat solid foods, to walk, to use the toilet, and so on. If anything, most new parents get too much advice about how to teach things to their children. The most important thing you can teach a child is that they are loved and that doing stuff is great. From birth they will want to do what you do and be like you. You read? They want to read. You listen to music? They want to listen to music. You play an instrument? They want to play an instrument. You wear shoes, use the toilet, cook, ride a bike, climb a tree, throw a ball, build things with blocks, know the words for things, and you can share those abilities with your child when the time is right.
My advice? Prepare to enjoy your life and to share that joy with this new person - for the next 20 years. That's so much more important than flashcards or the "right" decorations for the nursery.