Hi mkqq,
If it's an introductory flight, I wouldn't worry as your instructor will do this for you.
However, this is not the case, you can often relax a little bit, but you'll still need to keep the yoke in the position, otherwise, the aircraft's nose will start to drop. Similarly, in a turn, if you go back to centre, the aircraft will roll level, as by it's nature, it wants to stay straight and level.
Also, on take off, you will generally want to achieve either best rate of climb (Vy), or best angle (Vx). Vx will allow you to climb to an altitude in the shortest horizontal distance, but is a slow way of doing it. Vy will allow you to climb to an altitude in the shortest space of time, but a longer horizontal distance. We usually use Vx where I fly to avoid obstruction, but as you are at a steeper angle, it is more dangerous as you fly closer to the stall threshold.