I home school and find books from all over the place.
For maths I have used the Australia RIC blackline masters books.
Also the American teaching textbooks. My kids complained they were too easy so this year we started Singapore maths.
Study ladder.com.au has mental maths problems spelling tests and lots of online lessons. There's also khan academy with great interactive maths lessons online.
Although we are not Christian Sonlight has great resources. Look at their website, you can even just order the books. I bought several cores from them and threw away only 2 or 3 books that didn't fit with our science thought (new earth creation) the rest are secular normal books.
For grammar/literacy. We use study ladder. I also have some RIC Australia books on society and environment and literacy. This year I will try nitty gritty grammar.
For History I found a great book called the human odyssey by K-12 academy. I supplemented with sonlight books from their world history core.
The a online schools like K-12 academy that will do online classes with teacher, online courses where you are the teacher, and I just bought their book off amazon.
It's not hard to home school. Hopefully you can google some of those books and start getting some ideas. Usbourne books are also great for science.
You can buy a lot of books and subscribe to a few websites for the price of an
International School! Even the local schools now cost a few $$