Following the L shape Z340pattern on the Z-340 cipher:
I got
This in my fiirst pszzlee on thu pzlsing steck xnchange as oiy hope yeu ensjoy da ouzzm by the pay ta eerrows arre interdedt
This results in with 6th row shifted one step to the left and the final row’s letter being negated:
THIS IS MY FIRST PUZZLE ON THE PZLING STACK XCHANGE SO I HOPE YOU ENJOY DA PUZZ. BY THE WAY TE ERRORS ARE INTENDED
Or more elegantly put
This is my first puzzle on the puzzling stack exchange so I hope you enjoy the puzzle. By the way the errors are intended