I am new to ArcMap. I have an assignment to prepare map of each wards of a municipality. The data are point features. I need to print the map in different scales. like 1:2500, 1:5000 and also in different layouts like ISO A3, A1 landscape or portrait. The main aim of this assignment is to attain uniformity in symbology in different maps, to get standard font size and symbol size according to scale.

Questions:

1. Is there standards on symbol size, font size with respect to Paper Size?

2. I tried exporting layer (as .lyr file) and later imported in layer->properties->symbology. It works for me to make uniform symbols in different maps. Am I doing what I need to do or there is another better process? 

Any reading material, link on these topic will be good for me.

Thanks,