Start With a Book has a Bird Buddies Toolkit that has fun activities and reading lists, and it's free.

There's a Spanish I homeschooling curriculum, Georgia Virtual Learning has Spanish I-IV and AP Spanish, and MIT OpenCourseware has Spanish I. If you want to piece together your own thing, there's Destinos, BBC Bitesize for KS3 and GCSE, and the PASS Spanish textbook. All of the resources mentioned are free. I know you said you don't feel comfortable teaching from a book, but Google Translate works well with Spanish if you're worried about pronunciation.

I haven't used any of these before but, I know Georgia Virtual Learning has free AP Literature and Composition and AP English Language and Composition courses, and OpenStax has a few free AP textbooks. Maybe those will be helpful. You can also check out this website.

Natural Math may be worth checking out. Socks Are Like Pants, Cats Are Like Dogs and Bright, Brave, Open Minds.

I haven't used any of these yet, but I know they're all free and maybe something will be useful for you: MIT OpenCourseware Highlights for High School Alison High School Chemistry: Matter and Intermolecular Forces Alison High School Chemistry: General, Organic, and Nuclear Chemistry Georgia Virtual Learning Chemistry I Annenberg Learner Chemistry: Challenges and Solutions Xaktly The World of Chemistry Video Series Glencoe Chemistry Lab Manuals Flinn Scientific Lab Activities and Experiments ACS Virtual Chemistry and Simulations

Try this: https://www.lulu.com/shop/kelly-pederson/saxon-homeschool-math-1-daily-meeting-worksheets/ebook/product-12km2yr.html?q=Saxon+math&page=1&pageSize=4

Core Knowledge is a free curriculum you may want to check out. Their readers and workbooks are excellent and they cover history/geography, science, ELA, and math. For the circulatory system, you may want to check out Visible Body's Anatomy Learn Site and their eBook library. They're free and they have a lot about the circulatory system.

I made a list a while ago on Reddit with free resources, in case anyone is interested. Some of the links for textbooks and PE are ones I found on this forum, but with updated links because they didn't work anymore and I was able to find an archived version of the website that works. I was looking for a few specific resources for my daughter recently and found so many good suggestions here.