You don't have to be that organized or scheduled at first. Just go with the flow. If she's having a bad day, don't do anything sit-down and instead do something more active or take a field trip or go for a picnic.
What I about to say applies for older kids, like at least age 5. At her age I would just encourage unschooling or maybe some sit down play sessions with colors or counting or whatever. But use blocks or toys, not formal workbooks.
My first year I bought the K set from Calvertschool.org and it was a good way to start. I soon learned what my dd's learning style was, what she did and did not respond to, etc. I started to become more confident. About halfway through the year I had the courage to throw out the lesson plans and about half the books that were just not working for her. I kept some of the good material and we finished the year out.
Then I read The Well-Trained Mind which is kinda like choose your own adventure. She has guidelines for each grade level and a list of educational materials and where to buy them. You can pick from several differnent math or reading or whatever curriculums and put together a homeschool package that works better for your chlid and your personality. This has been working so well for us but I don't follow her schedule at all. We just do our own thing. When she's ready for the next handwriting book I order the next one. So what if she's ahead in one area and more typical in another?
We homeschool anywhere from 30 minutes to 2 hours per day. It just depends on the day, our moods, where we are with the material. She's plugging right along even without the formal structure and organization. She's learning a lot and we are relaxed and having fun. In my opinion, creating a strict schedule sets you and her both up for disappointment and a sense of failure.
You can also start with unschooling, which is probably what you have been doing all along with her and just didn't know it.