hello. I'm working on getting my level 26 shaman up to a level 80 for cataclysm. She is currently in enhancment for talents. I am kind of a noob so I have a lot of questions.
1)First off, i have a lot of blue armor from running dungeons and stuff like that. Is that armor good to keep for a long time? or should i be getting armor from quests?

2)also is engineering a good profession for a shaman? if not than what is? also i make most of my money buy selling items i get in instances so is there any better way for me to make money? i know there arent really good money making professions right now.
3)when i get armor, what should i look for? like spellpower or stamina or what?
Thanks!
oh yea i do ALL my leveling by running instances. is that bad? should i be doing quests too?