Help on training my horse to show --?

I would like to show my 14.1 hh 4 y/o Halflinger/Paint Gelding in Contesting this summer in 4-H . He's very fast , and he's only done contesting once . I don't think I'm doing flag races this year , and I might do keyhole , I'm not sure . What are some training tips to get my horse ready to show ? And how far apart do the poles & barrels need to be ? I don't have poles , so what else could I use ? Cones ? Please & Thank You ! (: