Im glad I helped. If you were in a major key, you would do the same thing I said before. If the chord progression was G, C, D. The only basic scale needed is the G major scale. The notes of that scale will work perfectly over each of those chords, you don't need to think about each mode as it plays over the chord unless you want to substitute. i.e. if you played the G major scale over the C chord, it's heard as a C lydian (same notes as G major). If you want a different sound you could play C major scale over the C major chord instead of C lydian. Only one note changes, F# becomes F natural and the alternation is only slightly contrasting.

As for a website. I'm sorry I don't know any off the top of my head but I know several people have posted with links to good guitar sites. You could probably search here or google and find what your looking for cause most guitar sites have diagrams of different scales.