This will very much depend on what space you have available. The best starting point would be to get a starter set....
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OO/HO Weathered Slate Roofing Texture Paper (Pack of 5)
OO/HO Asphalt Platform Sheets With Network Rail Coping & Yellow Line ( Pack of 5)
OO/HO Pointed Brown Stone Texture Paper (Pack of 5)
OO/HO Yorkshire Stone Texture Paper (Pack of 5)
OO/HO Network Rail Platform Edge Coping With Buff Tactile Paving (Pack of 5)
OO/HO English Bond Red Brick Texture Paper (Pack of 5)
OO/HO English Bond Blue Engineering Brick Texture Paper (Pack of 5)
OO/HO Victorian Weathered Red Brick Texture Paper (Pack of 5)
OO/HO Dry Stone Wall Texture Paper (Pack of 5)
OO/HO English Bond Weathered Red Brick Platform Wall Wraps (18mm to 20mm high)
OO/HO English Bond Yellow Brick Texture Paper (Pack of 5)
OO/HO Weathered Light Grey Concrete Texture Paper (Pack of 5)
OO/HO Concrete Hardstanding Texture Paper (Pack of 5)
OO/HO Rusty & Weathered Corrugated Iron Texture Paper (Pack of 5)
OO/HO Light Weathered Random Ashlar Brick Texture Paper (Pack of 5)
OO/HO Cobblestones Texture Paper (Pack of 5)
OO/HO Rusty Corrugated Iron Texture Paper (Pack of 5)
OO/HO Old Red Brown Brick Texture Paper (Pack of 5)
OO/HO Mixed Grey Roof Slates Texture Paper (Pack of 5)
OO/HO English Bond Dirty Red Brick Texture Paper (Pack of 5)
OO/HO Weathered Asphalt Texture Paper (Pack of 5)
OO/HO Old Stone Wall Texture Paper (Pack of 5)
OO/HO Weathered Sandstone Ashlars Texture Paper (Pack of 5)
OO/HO Worn Wooden Flooring Texture Paper (Pack of 5)