I need to make a Drawing in photoshop. This drawing will be printed on a 2A0 size (double the A0), and will have lots of names on it. The smalles ones will be about 2cm in height. Then in a later moment this image will be Printed on A1 size and the smallest names will be printed in about 5mm height.
The A1 version should be crisp and sharp while reading it at about 50 cm away. The 2A0 verison will be seen at about 1 Meter distance.
What resoultion should my photopshop project have in order to meet the requirements and print at the proper sharpness?