Here's what I do.
I cut the meat thin. cut vegies thick, this will keep the vegies from getting mushy.
I buy most of the Yakisoba stuff from Cash and Carry, the yakisoba noodles and the Yakisoba sauce, but you can buy them from other places, But I think their Yaki sauce is the best.
First I put the noodles in warm water and let them sit for about 20min, then I get my skillet hot with a couple table spoons of oil, I throw the meat and vegies in the pan at the same time, cook on high until vegies are just starting to get soft, add another table spoon of oil and throw the noodles in with a cup of water and cover, stirring every couple minutes, noodles will soak up the water, after about 5-7min I put the Yakisoba sauce in and stir well, cook for a couple more minutes then remove from heat and check for flavor, if it needs more flavor put more Yakisoba sauce in.