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It's 3.5, but I'd look at the cover of Conquest of Bloodsworn Vale, a 6th level adventure?
As for Dragon fights, the big thing is prep. Run out the stat block, and look at the map. Think through several things it could do. If it's got spellcasting, think through which buffs it would use. Familiarise your self with all the spells. Look at the fly skill.
Dragons are intelligent, and territorial. They should take every advantage they can. A full attack from a dragon can spoil even a meat shield's day.
On the player side though, at least give them hints that there's a Dragon around. Walking into a lair unprepared is an easy way to get yourself a TPK.
Nothing really comes to mind as far as modules go, but on the dragon issue, make sure to know what your group is capable of. If you have a paladin, make sure you know how capable the smite is (be sure to look at the errata). Give the dragon enough room to move around and fly. With everything else equal between a dragon and a paladin the dragon usually can't go toe-to-toe with the paladin and his smites (especially if he's got a high crit weapon and lots of feats). If your group is like mine, they'll pour all their resources onto our paladin to boost his offensive capabilities.