If you did all 4 brakes and they have all new pads, then I would just make sure your brake fluid is topped off. But not ALL the way to the top. Just make sure it's full.
I assume you got the rear pistons back in? You can buy a cube brake tool made for the job:
The grease they offer is often used to lubricate the slide pins for the caliper, as well as put a dab on the back of the pad to prevent squealing. What kind of pads did you get anyways, I run the Duralast C-Max from autozone.
You can go ahead and add grease to the hardware clips, but it isn't that important, they just may get a little rusty over time, and you may have to replace them with your next brake job, It's been my experience that they'll still last a long time even without grease, You can always remove the surface rust with a steel brush at that point.
Seeing as you have ceramic pads I don't think you'll have much trouble with noises or anything.
The brakes may not feel so good right now, but keep in mind the linings are still brand new, you have to give them time to break in. After a few hundred miles of stopping and going the pads should seat nicely against the rotors and the pedal will gradually get stiffer and the brakes will feel more firm and "grabby"
I know when I did my brakes they felt pretty soft for a week or two, but now my brakes feel better then ever!