Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page. X
Modify the drawing setup file for existing drawings:
FILE -> PREPARE -> DRAWING PROPERTIES and change the option PROJECTION_TYPE to first_angle
For new drawings to be created with this you need to read the drawing setup file by setting up the config.pro option "drawing_setup_file". This will read the setup for newly created drawings. Obviously, you need to save this "standard" setup file with the settings you want to use.
You also have the option of creating drawing templates: Define Your CAD Templates | Creo Parametric | PTC
For the units, see this thread: change default unis in creo drawing - PTC Community
I am not sure what you have or have not search already in the community. This is one I found for first vs third angle:
or this:
Are you using start parts and start assemblies when creating new models?
Set those to mm vs inch then it is done.
A search on "start parts metric" yeilded good results....
Does this work for you?