A General Contractor's License:
check with your state of residence.
Install a tarp to cover pool construction area. Install small sump pump at bottom of pool area
Pool with a vinyl liner.
To install the water return fitting above the ground pool, you have to switch off the source. After this you can then install the water.
Do you have a pool light niche already installed in the pool? If not, you need a pool builder to do the job to code.
Some companies, such as www.poolfencesoutheast.com, sell and install mesh pool fences. Others such as www.diypoolfence.com sell mesh pool fences that you install yourself.
Probably not going to be adequate.
Mirage
You can swim usually 24-36 hours after you add the liquid.
Install a floating pool skimmer
not for your own property.
Install a new filter
yes