Katherine D. answered 04/13/19
Patient and Effective Language Tutor (JPN, ENG, SPN, ARB)
As someone with an autistic little brother myself, I am so glad to hear you are willing to learn sign to communicate with him. A great way to begin would be to pick up some vocabulary, which the YouTube channel "ASL That" is great for. The signs are clearly demonstrated and explained and the vocabulary is grouped into helpful categories. I hope this helps! If you have any further questions, feel free to shoot me a message!