the gas flow out from the carburetor if i open the needle-valve 1-1/2 turns (only happen if i rise the tail 30+ degrees up), is it normal?
will this happen when i do 3D flying? do i need to close the needle-valve?

You need to get a book on two stroke model aircraft engines its is going to be to hard to explain fuel system, carburettor operation and fine tuning. Its hard to explain when you have the student in front of you.

Have you ever worked on any engines ( Weedeaters, lawnmowers, motorscooters, model airplanes, or cars)?

no

What engine have you got? You will be able to download a manual from somewhere.

The BEST thing you can do is find someone near you that flys. Even if you have to drive an hour or two to go over your heli, make sure its setup properly and give you some basic lessons. I don't remember where Easton is but there's a club in Baltomore thats pretty active and some others. The money you spend on gas and lunch will be far less than tearing it up a couple times till you get the hang of it.

Start here http://www.pilotlocator.net and I'll find the Baltomore Boyz web site and post it for you as well.

it's a os 37, i already downloaded the manual from the wed site, just wanna know if it is normal

wow! i just did my first flight, the engine started right up, it's amazing, there's nothing better than this on the world!!! totally different with my electric heli!!!