Im doing a very large SASE and SD-WAn Deployment and looking for any advice on things like Planning and Reporting.

Hello - and welcome to PMI's Online Community! I recommend doing an advanced search using specific keywords. This will generate a compilation of similar discussion-related threads. Here is a past thread that may be of assistance - https://www.projectmanagement.com/discussion-topic/180209/hi--can-anyone-help-with-processes-plan-involved-in-upgrading-wan-to-sd-wan-. You can leave a comment at the end for others to see and offer additional solutions.

Alternately you can search our wide variety of content located within the 'Templates' drop-down at the top of our page. Here are two that may be of value:
https://www.projectmanagement.com/deliverables/479507/deployment-plan
https://www.projectmanagement.com/project-...ementation-plan

I hope this helps!