I’m managing a startup business focused on logistics and we aim to start the operations across 3 countries within the coming 90 days.

I have 3 general managers, each taking care of his own territory. We have identified 120 activities with their subsequent tasks (up to 5 tasks under each activity) per country before we can operationalize and launch. I would need your advice on creating a workplan and a collaborative set of tools to:

-Document all the activities needed, their sub activities, and respective personnel.
-Keep track of time
-Use the tool (ie. google sheet ?) as platform to communicate
-Allocate resources
-Manage the activities, and pull out reports to make sure all is moving in line with the plan
-Make it dynamic that adding / removing / editing activities and tasks is doable
-Upload all the details into the form