Starting at planning menus - Any advice?

I'm looking to have tasty and balanced food while maintaining a reasonable budget and being more organised.
I know how to cook. I already have tasty yet not complicated meals I'm use to make but I never needed to be organised about it before.

So I decided to start to write menu in advance, do a some meal prepping probably a bit of batch cooking.
I found resources online to start following a plan but maybe you have advices for the beginner that I am.

Thank you!