Infrared film is problematic in terms of using a meter with any kind of EI/ISO number since that might not reflect what the film is seeing in terms of its sensitivity to red.
I refered you to the website as an overview with checking out his galleries to give you an idea of what look went with what subject matter at any particular filter-stop-shutter speed-film-development combination. I used to shoot Kodak HIE, and even now when I shoot Rollei IR I don't use a meter, from tests I got my best results outside, clear sky/very little cloud/very little haze, shooting/bracketing each shot F11-16 @1/125 w/an 89b(that would be at a 'nominal' EI rating of 50[again, everything depends upon conditions]), I shoot my Rollei IR outside under the same conditions between F6.3-8 @ 1/30 depending upon the conditions.
I had originally moved up in terms of a filter shooting Kodak HIE from the 25(wratten equiv.) and the 29, because I wanted a more pronounced 'wood' effect, a 25R will give you a filter factor of 8 w/ b+w film, the infrared-reflected heat issues with regards to your subject matter notwithstanding. The 29 is going to be more.
I'm trying to avoid suggesting an exposure, because what I like as a look, may not be what you want, hence my pointing you to this site, and I believe he has references to other sites, I'd prefer you perusing these images to see the look you want and what exposure created that image.
Another suggestion, besides this site, google infrared photography with an eye to any site that has accompaning images w/exposure info, because somebody can give you a suggestion you might use to expose your film, resulting in a look you may not like.
If you find a look you like, use the exposure info provided w/that image as a base for a bracket with one exp. over and 1 under for anything you consider important until you start getting a 'feel' for this film and what you want from it.
