First off gather your materials. For this I have some flint chippings, DIY shops or garden centres have these you can even use fish tank chips.
I also have grass and sand flocking material, some PVA glue and the find some self adhesive flooring panels. These I purchased from my local £1 store. i got 4 lengths in a pack for £1 and it gives you roughly 24 foot of track/road depending on how you cut it. You also need some scissors and a bowl to catch the flocking material.