Level up and wait patiently for legion to release in just over a month. At this point you can't really get to invested in current raids all too much. I wouldn't even worry about spending the gold to open up your garrison to level 3 and heading to the current quest/raid area. As soon as you can get to max level go to your main city in ashran and queue for dungeons or pvp to learn how your class has changed since mop and wait. Invasions will start soon and you can get gear off of those and pvp gear which is really easy to get.