1) Don't sweat it. A lot of people are probably saying this to you right now. BELIEVE THEM. You can teach your child. You can. I promise. There are tons of resources to help you and you are the one person in the world who knows your child best and you CAN teach them anything. You've already taught them tons of stuff. You taught them how to walk and talk, dress themselves, eat with a fork and spoon, go to the potty, tie their shoes and ride a bike. None of these things is really any different from math, reading, writing and grammar. You've got this.
2) The most important thing is that you have this child in your care for a comparatively few short years. At this point, you have very little indication of what/where they are going to do/go in their lives. But you do have a Scripturally-based idea of who you want them to BE when they get there. Do that first. Everything else will come in it's time. You first need to teach and model for them how to love God and their neighbor-- reading, writing and arithmetic can come along the way.
3) The next most important thing is to teach them HOW to learn. And teach them to LOVE it. This is waaaay more important than any one particular thing/subject/list/extra-curricular activity. Your goal is to create in them a fascination with how things work and the way God made the world, an insatiable desire to Find Out How and Why. Then you teach them HOW to Find Out and send them on their way. You give them the tools, let them do the work.
4) Lists of expected grade skills and behaviors have their place and can be helpful, but one of the best things about home schooling is that you have a chance to discover along with your child who God has created them to be-- the One, the Only, the Unique Them-- and help them get there. Don't expect that every child is going to fit the mold at every stage. You want your child to be a Mold- Breaker!
5) Home schooling is not about School-- it's about Mothering. We all know we need God's help in order to be Godly Mothers. Sometimes we forget we need God's help to be Effectual Teachers, but it's the same thing. Just like you need God's help to model Christian Womanhood, Wisdom, Thrift, Honesty, Bravery and all Virtues for your children; in exactly the same way, you're going to need God's help to teach them math, science, language arts and literature. Good curriculum is helpful, but mostly you have to start every day on your knees and then start their day on their knees, too.
Good luck! Have fun! You've totally got this!!