My general method for producing IR images is to do the following:
Equipment:
Nikon D50, Hoya RM72 IR filter, tripod, IR shutter release
Time:
Nice clear, sunny day, whenever the sun is bright and intense
Method:
Do an Preset white balance on green grass.
Set the tripod up with the camera pointing straight down at green grass. I usually zoom in at 55mm. Focus without the filter on. Then put the filter on. Switch to manual on the lens so that it does not hunt for focus with the filter on when you go to release the shutter.
On the D50 you can either take a photo, then select that picture as the PREset whitebalance. Or you can hit the 'WB' button, then use the toggle switch to rotate it to "Pre" on the little screen on top of the camera. Release the WB button. Then press and hold it in again. A flashing "PRE" will then be in the little screen. You then just take a photo (filter on and in focus) and it will be used as the preset white balance.
Generally i do this at f8 and about 1 or 2 second exposure. Maybe less maybe more. You just have to experiment.
After you have set your white balance on green grass, then you are ready to take your photo. Just compose and snap away. I generally use f8 to f11 @ somewhere around 1 second. You just have to experiment.
I just recently found that I get better results when I don't shoot in raw, although most of my images were done in RAW. You can see some of them here
http://ranmyaku81.deviantart.com/
Just go to Browse gallery.
Post processing:
The quick and dirty is to just create a duplicate layer. Do a color channel swap. Red -> blue and Blue -> red. Mess around with Levels. Then desaturate the Red and Magenta.
Generally I will play around with the image for a while before I get what I want.
I have a few IR photos on my deviant page if you are interested.
http://ranmyaku81.deviantart.com/