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Take the peak intensity of the star as recorded by your camera, then halve it. From there, inspect the star and find out how far away from the centroid that "half max" value is, and that'll give you your half width, half max.... to get the full width you need to look at the distance on both sides of the star. Hopefully that made some kind of sense? A picture would probably be easier...
Edit: I'm not sure what a "good" value would be with a 3.5"/px sampling rate. At 3.5"/px you're going to be very undersampled unless you have terrible, terrible seeing. Because of the impact undersampling has on stars (give them that square look with fast drop-off), I'm not sure that FWHM would be a good measure for you.
I have no idea about Maxim, I've never used it.
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