Points to consider....
1) Look for a couple of rolls of SFX (ILFORD) in your local store. It works well and will be likely sold where ever they sell ilford films. If you order online, go get the real stuff. The first one to experiment, and the second to do it right.
2) Choose a lens that has a red dot, just left of the focus line on your lens. This will be your IR offset for this lens. These marks were provided years ago, not so much now. Look at your older lens.
3) You develop your film at box speed. IE: SFX gets developed at 200 iso. The EFKE at it's box speed. Exposure (EI) is to compensate for the massive (usually -4 stops) light loss of the filter. So....IS0 200 - 4 stops is EI 12. Take one shot on the roll with out your IR filter. When you develop, that will be your reference image for proper development. IR film witll still develop as any pan film.
4) Try to load your film in as much darkness as possible. This stuff is more sensitive than other films.
5) Keep it fresh. IR sensitivity drops fast with age. It will turn into normal pan film, and can be shot that way when it gets old.
6) Best time of day are opposite. High noon is awsome. You want heat from the sun, winter or summer.
So what I do.....
1) Find a scene.
2) Meter for the box speed of your film. If using the one in your camera, take the filter off your lens to do this.
3) Put your camera in manual mode and take the reading from above and adjust for -4 (or -5) stops. If this is the first time you have used your filter, try both.
4) Focus without the IR filter. If you have a marked lens, adjust accordingly. If not, you will need to braket to find where your sweet spot is. Take notes.
5) Put the filter on and shoot.
You should try to stop down as much as possible until you have worked out the focus on your lens. Develop with the developer you are used to. You do not want to introduce too many variables until you get the basics worked out.