Sho Nuff...
I'm assuming all the drum samples are wav/aiff files, so I'll start with that, and I'll do redrum first because its the easiest.
Put them all in one folder (this isnt nessicary but it helps keep your HD organized)
Open redrum in reason, there are 10 tracks in redrum, each with an "open" icon, click this and browse to the folder your kit is in.
I usually lay out Kicks first, snare, HH (open / close) toms, cymbols. but you can lay it out how ever will be easiest for you.
Are you using reason with a DAW program or just straight out of reason?
I would suggest using it with an audio prog like protools, cubase, sonar etc (I use ableton because it works best for my application) and "rewire" each drum track to its own channel within the other program.
To do this load protools/abletoon etc (only one lol

) then open reason.
create your drum kit, and hit tab (turns the rack around)
Now youll see the back of the reason "rack" drag the stereo outs for each individual channel of redrum to the channels on the rewire/hardware interface (top most rack Unit)
ie. channel 1 on redrum to channels 1/2 on the hw interface (stereo)
go into the DAW create 10 tracks (or how ever many you used in redrum) and change the source to reason, and pick the outs (same as the back of the rack but reversed, 1/2 go to channel 1 in the DAW) mix and effect like you normally would a regular drum kit, the only difference is you have 2 HH tracks, one open and one closed. Im downloading the NS kit now so i can look at it, and get a better idea of how you can apply it, it mightbe easier than this, but you never know
Let me know if this helps, I'll takew a look at the kit and try and find the easiest way to implement it for you
-C$