Looking for a little help on this, and hoping I didn't screw up anything serious.

Did my brakes yesterday. Changed both the rotors and pads. I admittedly have never done this before, however read and watched a ton of videos to where I am certain I did everything correctly.

Jacked up vehicle, sat on jack stands. Removed brake line bolt to allow for more flex. Put the caliber that I was working on on a jack stand. Used old brake pads to compress the caliper piston. Grease on the back of the shims. Put back together. Factory torque specs. Done.

Pumped the brakes multiple times after finishing and they will not stop going to the floor. Thought maybe it was because the vehicle wasn't on (being it's an electric motor). Did the same, same results. Drove around block, it slowed down, but very slowly.

When I got back I could tell there was a distinct suction noise coming from the pedal area after I would release.

Trying to figure out what my issue could be?

I don't see how the brake booster or master cylinder would have gone out from a brake change? But maybe I'm wrong?

Air in lines? But I didn't bleed brakes or remove the nipple so not sure how that would happen without a crack in the line. And I am experiencing zero leaks anywhere.

Any tips or possibilities of where I may have gone wrong? I have a trip next week so trying to pinpoint stuff before I take it to a shop (assuming it's a simple fix).

Brake fluid is also level so don't see it being low on fluid.