i also had this moment where you must choose if you will use templates or
creating new configs.
I had trouble with the templates because it didn´t run as I thought I contacted
the Meraki Support for Help.
My customer had 4 Location in 1 country.
I´m honest because I am also new with Cisco Meraki it will take youre time.
My advice is using templates only for 1 location and not for other locations,
because when it didn´t go as you planned you will lose time by searching for issues.
But maybe a Pro can help you by creating the templates and it will go as you wish.
Hope I could help you a little bit.