Yard flatten and some other questions about backyard?

So, we have a basketball court in the backyard of our home. The basketball court is the only flat land in the back, then the rest is a hill. We are considering getting a pool. I have some questions. 1. Who would I hire to flatten it? (Like What job) 2. What would be the average cost for that? 3. If we just... show more So, we have a basketball court in the backyard of our home. The basketball court is the only flat land in the back, then the rest is a hill. We are considering getting a pool. I have some questions.

1. Who would I hire to flatten it? (Like What job)
2. What would be the average cost for that?
3. If we just flattened it and did not get a pool for a while it is required we need a fence?
4. How much would a pool cost?
5. Do we need a fence with a pool?
6. Do we need to let the town know before we start?
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