Ok, I see what you are asking.. I was abit confused by the question.
Shift first, throttle afterwords. When you get comfortable with it, you can do both at the same time, but you are saving fraction of a second this way.
So if you are stopped somewhere and know that you will have to take off fast, you should pull in the clutch shift to first before the light turns green. Then you have to give it gas and let go of the clutch at the same time.
This is not a drag race, so your best strategy is to give it just enough gas so that you can release the clutch fully without bogging down, and then open the throttle. Less chance of looping it that way, and it sould be plenty fast for anything you'll need, short of a race.
You should memmorize at approx what speed the engine redlines in each gear. For my bike its 1st-100mph,2nd-120mph,3rd-140mph. Yours is probably different. You never ever ever EVER want to downshift too far, placing your engine speed to above redline. Rev limiter cannot help you then, and you will bend your valves.
So say you are going in third at say 50mph. you need to pass someone in a tight spot. If your bike is equiped with a slipper, close the throttle as you pull the clutch in about half way, tap the lever to first, dump the clutch, and open the throttle about 70%. That should get you shooting out there like a rocket.
If your bike does not have a slipper, it gets a touch more complicated. Pull in the clutch all the way, and as you are tapping on gear lever, give the engine enough gas to get the rpm to where you think they are going to be once the clutch is release. then release the clutch and open the throttle. Its called bleeping the throttle, the reason you want to do that is that otherwise the engine compression will lock up your rear tire. If you want to see what that feels like, pick a nice streight road, start in first, and dont shift, just keep going faster untill you are only a few thouthand rpm from redline (Should be going 60-90mph). Then pull in the clutch, close the throttle, and just sort of cruise for a few seconds.. your speed shouldnt drop much, but the engine will slow down to idle.
Then make sure you got a good grip on the bars, and just dump the clutch. Your rear tire will lock up, most likely slide about a foot to the side, then fishtail for a bit. Its nothing too bad if you are ready for it, but if you are not it can easily throw you over.
Hope that helps.. In short just go practice...