Sign language for the baby

I have voiced my concern about Mieka who screams and hits at other babies when they come near her. Tasneem, an occupational therapist, suggested that “some children develop conceptual language faster than they develop language ability “. They get frustrated, and that’s why they start to hit. Some throw tantrums. She suggested we could try sign language. It has made me think that it is worth a try. I googled some of information on the Internet, but I am not sure how to learn the signs to the baby. Last night I tried to learn her about the sign for a ball, holding my hand in a round form, and twisting it. I did not get any response.
Mieka waves at us, and she claps her hands when we sing “Handjies klap” (clap the hands), but we are still trying to teach her how to blow kisses to us. She starts to make the b-r-r-r sound while pulling her hand over her mouth when we blow kisses to her.
Do we create our own sign language, or is there a good site out there which could help me? I am not very creative coming up with signs.

(Another photo by grandfather James on Sunday)