About your freehold home on the Estate

I have recently bought a freehold residential property on the Estate. What should I be aware of?
I want to remove or reduce the size of a tree on my freehold residential property. Do I need permission for this?
Can I convert my freehold residential property into flats?
Is there a cost to obtaining consent?
I want to make alterations to my freehold residential property and have planning permission. Can I proceed?