We are all of us going to repeat what exists on other SFX threads and worse than that leave out bits that exist on other SFX threads. I'd do a search. There's lots of info. However just to start you off. The red 25 which is all I have used, like you, will give you black skies and black water on sunny days but will not give you the "wood effect" i.e, the white silvery effect on deciduous foliage. If you have a camera that meters through the lens as I have then relying on camera internals should give you a good neg. It worked with my Pentax but if not then based on Milsom's recommendation, use F11 at 1/60th.
Don't know where you are but the book I'd try and get hold of is Hugh Milsom's "Infra Red Photography. Easily found in the U.K but probably less so in the U.S. where Laurie Hayball's Advanced Infra Red Photography is probably easier found.
Don't know if you have a standard against which you are judging what SFX will do but do not expect the equivalent of Kodak HIE or indeed any other IR film. SFX is different. If it isn't IR weather or you've tired of the limited IR effect with a red 25 then take off the red 25 and shoot normally. It's fine as a normal ISO200 film.
pentaxuser