well on 1" pipe max pressure is 370 PSI excluding craftsmanship at joints, i dont think toy will have to worry about it. with the 9.5 @ 4' head you will be right around 800
GPH (see link). i think you are well on you way. though belive it or not it's not that complicated, i've never had to do any calculations on building a setup most of us do it with simple math and feel. give it 6 months and you'll see what i mean.
PARTS LIST AND SPECIFICATIONS FOR MAGNETIC-DRIVE 24/36 AND PONDMASTER 24/36 PUMPS