Post by Rystrave
What are valor points used for? Valor is used to buy gear from factions at level 90. You must gain enough rep with a faction in order to buy better gear.
How do I find good t mog gear?Doing old raids from vanilla (original WoW), BC, or WOTLK would be a good start. For a DK, soloing old raids is cake. You can also go
here and see a list of transmogs available in sets.
What are dailies and where can I do them?Dailies are quests you do everyday to gain rep, gain valor points, and gain gold. Each faction has their own seperate set of dailies. Depending on which faction you choose first depends on where you start. Going
here will get you a list of all factions current for Mists of Pandaria.
How do I get cool mounts? Again, old raids and dungeons have cool mounts. Go
here to find out where each mount comes from.
How do I get in raids?At level 90, getting into raids may be difficult if you're not in a guild that raids. There are guilds that do pug, but most the time they only want people who know what they're doing. Your best bet is to find a raiding guild.
You can also go into lower level raids by yourself to solo.
Post by Loremastertappa
Here is a guide created by Xyexs that may help you understand a few things. It explains a lot of what you were asking about. If you still have questions, feel free to ask though. :)