If you still have the AFS 18-200mm lens that should work for IR. That lens takes a 72mm filter. The Hoya R72 filter refers to the cutoff wavelength of 720 nano-meters for IR. So it attenuates visible light and passes IR above the visible light spectrum. The filter is deep red and you won't be able to frame the scene. It's better to use a tripod before adding the filter.
As far as IR goes the best IR reflectance is in sunlight with green foliage in the picture. Man made material like concrete don't reflect IR hardly at all. So IR photography is aimed more to landscape photography.