You will do best running as training the same distance of the race you want to prepare for. The distance you run in training should be the same as race you are training for. If the race is a 5k you should run that every day. If it is a 10k you could run it every day if you have been running that distance every day, if not you should work up to it by adding from 10% of your distance a week. If it is a longer distance such as a half marathon you should run it at least once a week and maybe 7 miles 2 or 3 times a week and a 5k on the other days.
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