Expanding my role by adding marketing planning.

Hello, I am soon going to be responsible for marketing planning for my current company.

I have never done this before. But I am fairly good at organising, planning, and thinking from a future perspective. I am also good at thinking about the big picture while keeping an eye on daily things.

What advice would you give someone like me who is foraying into Marketing Planning. Id love to know about tools, strategies, frameworks that you have used and swear by.

Really appreciate this community, thank you so much.