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If you may want to set up a Dressage arena inside your regular arena, that requires more length. A small dressage arena is 20X40 meters (or about 66 feet by 132 feet), a large dressage arena is 20X60 meters. A standard size competition arena is about 100'X200' and is large enough for full jump courses and other uses. Also consider the fence material.
The different size dressage arena markings. The images here, show the dressage arena letter layouts for a 20x40m arena (top) and a 20x60m arena (bottom). The images show the location of the letters that denote particular points in the dressage arena. Arena sizes can vary slightly depending on the organisation hosting the dressage competition. The British Dressage standard size arena is usually 40 metres by 20 metres for prelim and novice tests and 20 metres by 60 metres for advanced novice and grand prix competitions.