Step it up a notch, create a trial account that has max level 20 and create an army of holy priests - you cannot do raid conteent but you can do thee daily dungon and scenario on both normal and heroic every day - a 20 holy priest will basically 1 shot most mobs in them with a single holy nova - bosses generally cast holy fire + holy nova.
You can link these accounts to your paid full account and they will share mounts, transmogs, heirlooms, achievements. For th purposes of earning easy and fast bronze to buy mounts its amazing.
Already have a WoW account
You can have up to 8 World of Warcraft accounts in the same Blizzard account.
You can add new accounts through your [Games & Subscriptions] Account Management page.
The next time you launch the Battle.net App, use the drop-down menu on top of the PLAY button to select the World of Warcraft account you want to log into.
Lifestorm meta gem
Searing Light tinker
Sprint for cogwheel
The rest of the tinker gems at level 20 dont mean anything as things will die fast. Focus on getting items in every slot, if the item is blue keep it in that slot as they have main stat (greens just have stam) - spend bronze on upgrading any blue items you get to as high as you can.
As for wanted stats - move speed gems are bis beecause the chance that you will hit a dh with 280% move speed and can get to and kill the last boss before you loot the first is very high. Holy priest mastery interacts very nice with the searing light gem, turning your healing + mastry hot healing into raw damage should anything live long enouhg for it to proc.