There is no easy answer to ‘what level of torque should you select?’, as different amounts of torque are needed for different tasks.The level of torque you need will depend on a number of things:
Screw diameter and length
Driving in a screw with a larger shank diameter and longer length will require more torque than a shorter, thinner one.
Type of material
Drilling or driving into tough materials such as metals and hardwoods will require more torque than materials such as softwoods or plastics. For example, if you were drilling a hole to install a retractable washing line, the level of torque you would select would be lower if you were positioning it on a wooden post in comparison to a brick wall.
Whether or not you are drilling a pilot hole
If you drill a pilot hole first, then less torque will be required when you come to actually drive in a screw or use a larger drill bit.