In order to take off, you only need to push the throttle up but make sure you do it very slowly till the copter lifts off. Push it back to zero to see how the machine will land once the flight is over. Remember this is the most important step so master it by repeating it many times and then checking if the copter tries to move on its own.
If you are not pushing any control and the machine is still rotating, rolling or moving, you need to use the trim buttons to balance it out. Without doing this step, you won’t be able to get a smooth flight so don’t overlook its importance.