Completely new to pools, my Intex 18 x 9 is currently filling with water. I originally came here to find out if the bend on the side poles is normal (it is while it's only half full) but managed to terrify myself when I read stories of pools collapsing—that's what happens if you search for 'bent poles'! I have double checked the pool is level, so I'm pretty chilled out now 
See the link below for a great start.