If you are doing it properly, wok cooking should be on a stupidly high heat. The comercial restaurants use 10kw gas burners. Most domestic stoves top out at 3.5kw if you are lucky. Our French thing does 5kw and it was instrumental in our decision to buy it. IMO, you cannot do a good job with a wok and an electric heat source as the heat just isn't there. You'll boil the food, not stir fry it. I'll probably get flamed for that comment (pun completely intended)
Choice of oil is important. For most wok cooking, I use peanut oil as it is flavour free and does not burn. Olive oil (whilst I drink the stuff) is just not up to the job as it burns at too low a temperature and imparts a flavour that clashes with Chinese food.
Many recipes start with the 'holy trinity' of Chinese ingredients which are garlic, ginger and spring onions (though I believe you guys call them scallions). Chop the white part of the spring onions finely. These go in early. The green parts and (if you like 'em) the tops go in last minute for texture.
Here is how I do cashew chicken. Recipe taken at own risk, involves flaming wok. You have been warned, no liability taken for damage etc.....
Heat the oil in a well seasoned wok (google for that bit, it's smoky!). Throw in your garlic, ginger and white parts of the scallions. If you've got enough heat there, they will immediately jump around. Seconds later, throw in finely sliced chicken. Stir to brown a bit. Throw in some rice wine (xiousing I think it's called). Impress friends and neighbours by watching it flame, which it will. Put out eyebrows and calm screaming infants before next stage.
Throw in some red peppers. Chopped to same kind of size as chicken.
Throw in soy sauce (Kikkomen is superb), and some yellow bean paste or sauce. And a bit of sugar. Add a little water if you feel it needs it.
Chuck in the cashews. They will be better flavoured if you've dry fried them first in an oil free pan earlier, but no-one's going to shoot if you didn't. Throw in the scallion green bits. Serve with rice and a bolus
Variations:
You can add chilli (fresh) with the garlic, ginger and spring onions. Or the little dried red 'scuds'. Takes it more in a 'kung po chicken' direction.
You can add chopped corriander at the end (cillantro in your language)
If you have no yellow bean sauce, you can take it to sweet and sour territory by using a bit of ketchup, clear vinegar (preferably rice vinegar) and sugar. Lots of sugar! To thicken, you can use cornflour disolved in water but I prefer to reduce.
Good luck.
Gary