You don't give much info regarding you garmin, has it got maps on at the moment, original maps or just osm maps, dose it have lifetime updates,
If it has installed original maps then I recommend installing basecamp from garmin website it's free then you can upload the maps in your garmin onto basecamp then start routing on basecamp then transfer your routes over to your garmin,
If you haven't got any original maps or osm on your garmin then be ready to spend hours learning how to get free maps transferring and using them,
I would recommend that you buy some maps as its a long process to learn
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