Every tip I see from every successful writer says the key to it is plan your script. Plan it meticulously, know every beat and breath of the story before you start.
Problem is, the most successful writing I've done has been doing the exact opposite. Get a vague idea and start writing to see where it goes.
Doing this has always led to more fun, interesting and surprising stories than the ones I plan out. Ultimately these leads to lifetimes of rewrites but I can live with that.
So my question is this. Are there any successful writers out there who don't subscribe to the 'plan everything' plan?
Note: This isn't me saying that planning is a load of old balls and anyone who does it is a massive square. Just that it hasn't worked for me.