Usually with Rangers I focus on light armor, sneak, archery, one-handed & illusion.
The archery, sneak, & light armor should be self explanatory. The one-handed's because DnD Rangers are all about dual wielding, & Illusion's for calming animals mostly.
Rogues, I usually build around lockpicking, speech, pickpocket, sneak, & one-handed.
Because, well those're the Thief-iest skills. Build 'em for heavy sneak attack bonuses, like DnD Rogues, & then focus on non-combat skills.
I forgot to mention that both of those usually dabble in alchemy to some degree.