Refer to this link for a "how-to" approach to G2V calibration - http://www.iceinspace.com.au/forum/s...75&postcount=8
Ideally, you should shoot flats for each individual filter as dust formation between the filters can be different. Some take a different approach, by "attempting" to keep their filters clean and simply use a unfiltered or clear flat the represents all other filters. If the FITS header does not contain a filter name, then it is usually applied across different filtered light frames. This can work considering the overall optical train configuration is identical regardless of filter i.e dust on optics or vignetting, but I'd question the accuracy. Personally, I take flats per filter. This risk of scratching filters keeping them clean does appeal to me.
Use the same darks across all filters. So in other words use similar exposure times and build a library. My dark library consists of 300s, 600s, 900s and 1200s masters (sigma reject combine of a minimum of 12 subs). Take them during the day if you can set your cooling point low enough. Don't waste precious night time hours taking darks. Refresh the library often as pixel states change. IMO a library that is a month old is needs to be refreshed. Some take darks on the night of imaging, this gives the best accuracy. Depends of far you want to take it and if you can perceive the benefits. For photometry and astrometry, sure, darks every night you take a light, but for pretty pictures. hmm not much gain IMO. Of course this assuming the camera is temp. regulated. Perhaps start with 600s luminance and 300s RGB if the camera is ABG. Much shorter if NABG
Play around with lum shots to get a feel for the processing. Or take some RGB only frames to see how your colour balance is working out. Straight RGB is good for bright targets, but for the dim, you'll want to introduce luminance data. There are good resources on the web for LRGB techniques.
Above all, have fun. Mono imaging with filters takes patience, but yields a superior result esp. when using Ha or specialised NB filters.