Currently Being ModeratedMay 25, 2012 3:13 PM (in response to Davidfrommys)
When you import the clips you can select optimize media and that will convert it to ProRes.
Currently Being ModeratedMay 25, 2012 5:48 PM (in response to Davidfrommys)
Whether you use 24 or 25fps (and I'm assuming there's a 30fps option there too) will depend on your location, and personal preferences / shooting situation. FCPX will handle all those rates.
25fps is the standard PAL broadcast frame rate, so if you're in Europe, that's what you should choose for a broadcast finish. 30fps is the standard NTSC (North American) broadcast frame rate. 24fps is film speed.
Try a few different frame rates with similar shots and see how they affect the look of the footage. If you have a lot of fast motion (eg, recording sports), you might prefer a faster frame rate to avoid staggered frames. Or if your project is more static, 24 might suit you better.