You're close enough to starting northrend quests that reward a lot of good spellcasting one-handers and a few shields, you'll see a jump in all item spell damage and armor on shields.

For pvp you want to follow a simple guide for choosing gear. Most level 70-79 leveling pvp elemental shaman prioritize stats like this.

spellpower>stamina>intellect>crit>everything else


Most level 70-79 leveling pve elemental shaman prioritize stats like this.

spellpower>intellect>crit>hit>everything else


Since you're new, I'll point you towards www.wowhead.com which is pretty much the library for all things wow. This way you can look for and find out how to get items you want making it a little less overwhelming.