you should stick with your right arm....very very few pitchers can and even fewer use both arms. hope that helps. also, watch some youtube videos on windup...you do what is called a "balk" quite a bit
"I know very few pitchers who use both arms. If I try to use both of them, it's going to take me a very long time to learn. Thank you for the explanation of the word 'balk' too. I will look more into it. Thank you."