Don't panic! I am sure everything will fall into place soon, and you will have a nice routine which works for YOU!
Some things which have helped me keep the "overwhelmed" feeling away are:
I only begin one guide at a time at the beginning of the year. My oldest did Bigger for two weeks before I added LHFHG (which we are only doing half-speed).
We do the guide in the same order every day. Dd8 begins with Math and DITHOR. Then she moves onto cursive, music in her room, and the extension reading. Since she does those independently, I work with my youngers while she is doing those things. Then we do History, Lower left activity, Bible and Science. Usually break for lunch. (We could read storytime at lunch if needed). And finish up with Poetry, English and Dictation. Usually if we start at 9:00, we are done around 1:00 using this routine.
Some basic supplies which may be helpful are crayons, markers, scissors, white glue, glue sticks, printer paper, manilla paper, construction paper, watercolor paper, tempera paints, watercolor paints, plastic paint palettes, various paint brushes, glitter glue, yarn, ribbon, dried beans or macaroni noodles (for math activities), nice "play" money, a globe, US map, and colored pencils. A ruler and measuring tape, too.
The Durable Post-It tabs are invaluable!! We are in different places in math within the guides, and I like to keep Poetry and other areas marked. Each day when we finish, I move the tab to the next page and we are ready to flip right to it the next day!
Each child has their own drawer (in a plastic 3-drawer file) that they keep their books in so they are organized. I also keep most of the craft stuff in a cupboard so that is together and I am not hunting around.
Those are a few things which have worked for us. May your school year be blessed!
