Asha
I use a Hoya R72 filter. This is generally more expensive than a deep red filter but, from the examples I have seen on-line, gives a much stronger IR effect. It is designed only for infrared and is almost opaque, so that you can't see through the lens (and hence the viewfinder) when it is attached. A TLR is a good approach since you can leave the filter on the taking lens and of course the viewing lens is unaffected. A rangefinder will also work - assuming it has speeds down to 1s because I usually find myself shootig at 1s at f11 in full sun with the R72 filter attached.
The only IR film available in large format is Rollei IR400, which I used for the above shots and I like in 120 and 35mm. I have a pack of 4*5 Rollei IR film and it is extremely thin which makes it difficult to handle. So far I have screwed up a few sheets due to handling issues and haven't managed a successful shot.
"Bare Trees" shows less of an infrared effect because there wasn't much foilage containing chlorophyll in the shot. The other IR film available now is Ilford SFX 200 which is less IR-sensitive than Rollei IR400 and produces a more subtle effect, such as this:
Developing is just the same as any other B&W and I have used Rodinal, Fotospeed FD10, and HC-110 without any issues.
Kevin