There is no straight answer to this question. The size of the pool at any particular school would depend on the needs of that school, local laws and ordnances, the engineering, the average number of expected users, how the pool is to be used, etc.
how long u want it to be
Generally 25 yards but it can be 50 yard or 50 meters. 50 meter pools are used in the long course season of club swimming. High school swimming would be done in a 25 yard pool.
About 5 feet
Mostly just depends on the high school, if a pool is available to the school, and course options.
There are many different lengths. Many pools are 25 yards long. Some can go up to 50 meter long.
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No. It uses the neighboring Surf'n'Swim facility.
The width of a high school swimming pool is 25 meters. Short course pools are more common at highs schools and public swimming locations.