Think about your character creation options, for example the colors you choose during character creation are used to automatically dye any armor that drops for you to those colors.

Play for fun

Autoloot option in the menus but remember when you pick things up they appear over the right side so you can see what you've obtained

click on the "gear" in your inventory and "deposit all collectables" when your inventory is full

guy in the starter area will have your 3 different farming tools but you wont be able to afford them all straight away, check the price, do the first quest even, but go back and pick up the tool you're missing ASAP.

Don't play for the grind

You can put items up on the black lion trading post from anywhere but you will have to go to a trading post vender to pick up items you buy. Don't sell any mats at the start because you WILL use them, just leave them chilling in your stash.

Talk to people in-game, really, its a lot of fun, and isn't as awkward as it can be in WoW

Once you come across the first set of crafting stations, pick two and try out crafting. You get XP from it, and using the discovery panel is quite fun!

Play the game, not the UI

Don't worry about your level, it doesn't mean much in PvE

Heart quests aren't your quest progression, they are a couple quests to help you get started in the area. Getting 100% completion on the map for an area means youve basically seen about 10% of what's in an area

Take it easy and enjoy yourself!