You could use popsiclestick sticks for the fence with modular bases, but if you're interested in a more realistic look, usually fences have cylindrical posts and then rectangular boards. It'll depend on your scale but I like to use squewer sticks that they use for cooking. If you're looking for a larger scale I know that here in the States Hobby Lobby sells all these little wooden post like things but I don't think they're dirt cheap and they're perfectly round. I find it looks kind of unnatural so for a more farm/country look I like to take a small rectangular piece of wood and carve it into a semi-cylindrical shape. I generally find glueing is fine but if you're going for a larger scale or more realism you could represent nails using some gauge wire or solder ( for larger scales ).