Gravel Patio area. How deep to dig?

I am going to put a gravel patio area in my garden. Somewhere just to put a table and chairs and BBQ. The area will be about 10' x 12'. Do I just dig out the existing grass, lay a foundation of sand (what depth) and then pour the gravel on top of the sand (again what depth for the gravel). Do I need to put in some sort of cover to stop weeds growing through? Would this go down first or on top of the sand? I will run a border of granite type blocks around the perimeter.

I have an old carpet to dispose of. Would that do to stop weeds?

You should get all the guidance you need from from Paving Expert, specifically their gravel section.

Thanks Leo. Just started clearing out the area of bushes, grass, and tree roots.

No prob, best of luck with the project!