For your tank... I'm assuming you meant which race should you be, not which class, since you seem to want to be a warrior! Well, if you were Horde side I'd recommend Tauren for the health buff. But honestly, I *never* pick a race based on the racial features - only based on the flavor. If you are going Alliance side, I am quite partial to dwarf warriors myself but pick whatever seems most fun to you!
By constantly doing quests, you will experience a very different game than if you just level through pure grinding. You'll be out there making a contribution towards the Alliance or the Horde. Doing these quests takes you through the heart of the game's story AND provides the fastest rate of experience. Have fun in World of Warcraft and enjoy developing your hero - your adventures will gain you great reputation amongst the land.
As you're leveling, I generally recommend you just follow the natural flow of the progression through each zone. They're laid out fairly reasonably. But don't be afraid to hop around, especially if you're near a quest objective. You shouldn't actually need ALL of the zones listed to reach 62. Pick the ones you like best. It's much more important to simply be as focused as possible and flow from one quest to the next.
Try to gather up all quests for a dungeon before trying to queue up for it. Preferably pick up dungeon quests as soon as they are available to avoid getting them when you are over leveled. Dungeons themselves reward a good amount of experience due to the grouping of mobs, but the quests on top of that reward great experience and decent questing gear.
Baelgun - Alliance Baelgun - Horde Balnazzar - Alliance Balnazzar - Horde Blackhand - Alliance Blackhand - Horde Blackmoore - Alliance Blackmoore - Horde Blackrock - Alliance Blackrock - Horde Blackscar - Alliance Blackscar - Horde Bloodfeather - Alliance Bloodfeather - Horde Bloodhoof - Alliance Bloodhoof - Horde Bloodscalp - Alliance Bloodscalp - Horde Blutkessel - Alliance Blutkessel - Horde Boulderfist - Alliance Boulderfist - Horde Bronze Dragonflight - Al... Bronze Dragonflight - Horde Bronzebeard - Alliance Bronzebeard - Horde Burning Blade - Alliance Burning Blade - Horde Burning Legion - Alliance Burning Legion - Horde Burning Steppes - Alliance Burning Steppes - Horde Bladefist - Alliance Bladefist - Horde Blade's Edge - Alliance Blade's Edge - Horde Booty Bay - Alliance Booty Bay - Horde Borean Tundra - Alliance Borean Tundra - Horde
Guild Banners. The Banner of Cooperation and Battle Standard of Coordination will increase the experience from kills. They both have a 10 minute cooldown, but when you use one, the other is only locked out for 2 minutes. I was very bad about using these, so it might be worth using a macro to drop them on your first attack against an enemy. Keep in mind you must have reputation with your guild before being able to buy these, so new character may have a bit of a wait before picking them up.
Congratulations on reaching Level 120! There are a myriad of new things to do. The first thing you should do is head to your faction hub ship where you have been doing your mission table quests and footholds to pick up and complete the quests necessary to unlock World Quests. World Quests will provide you an opportunity to grind reputation levels, acquire gear, and gather Azerite. There are tons of new things to do that we will cover in our Level 120 Battle Guide found here: Level 120 Battle Guide