It is usually nice although not necessary to have a large clock to display time for all runners to see on the finish line. Some running clubs will rent their equipment. You will at least want a finish line painted on the road for runners to cross. In bigger races they also have chutes to keep runners single file so that you can keep track of the order runners cross the finish line. If you are having both a five and 10K it is necessary to have a separate chute for each one. If you want you could even have a separate chute for men and women. They would then be separate on the results board. It is easier to keep times and results this way. If you want a chute for your finish line there several ways to make them. The most common way is use large coffee cans filled with cement and pipe with a tee at the top. When several of these are lined up a rope may be passed through them. The problem with these is the weight. Another system is to use PVC and make V’s at the bottom to support them. These are light and much easier to carry around but not as stable as the concrete ones.