I think the NRS is Giant's bread and butter XC suspension frame. As far as the pedals, they are probably SPD compatible, but a pic you can share with us might help. Shoes will depend on what system you have on your pedal, but most of them are either SPD or Time compatible.

There's different foot retaining systems out there, among them:

Shimano SPD
Time ATAC
Crank Bros EggBeater
SpeedPlay Frog (I know this is SPD compatible)

The SPD cleats should be the cheapest and most common out there. I've seen the EggBeater cleats as low as $15/pair but not sure.

These are all mountain bike pedal standards.