It is so easy to get overwhelmed with information when it all comes in so fast. Do not despair. You will sort it all out in time. Start with one area. Testing We use observation to keep up with where our children are at, not expensive tests.
Some states require testing.
We highly recommend private testing done for learning challenged special ed students. A homeschool friendly tester can be licensed and may cost money. Save up for it. Other states require testing, but do not require you to send the results anywhere. As the burden of proof is on the parents to prove that progress is being made, some families, instead of testing, keep a journal or portfolio, complete with pictures and any work done, in case of trouble.