Your instructor on your introductory flight will brief you on this.
Different aircraft require different lift off techniques; personally with a 152 doing a normal (flapless) takeoff I prefer ( and it is my personal preference) to pull the yoke back just slightly aft of neutral as I begin to roll and the aircraft will then lift off when it is ready.
With a Shadow you MUST pull the sidestick right back as you begin to roll and when the nosewheel lifts, you push it slightly forward to keep it off the ground and once again, it flies off when it is ready.