Season 3 Valor points can be used to upgrade gears your character geared.
You will need totally 8000 Valor points to upgrade a full set of gear to the highest level(16 items, 2 upgrades each).
4875 Valor is the maximum you can acquire per week in WOW patch 6.2.3:
Kindly Reminder:Possible account termination when using illegal leveling or illegally obtained gold.