Hi Howard. If you go to Settings/Preferences > Preferences > Settings, you can change your time prefs to what you need. 25fps is the european standard for video (PAL) whereas 30fps (NTSC) is American. 24 is film quality. By itself, it shouldn't really matter which you use but if you plan on syncing the animation up later with audio or compositing with video or film, then I'd suggest sticking with the format you're going to work with.