Wthout professions you have:
Farming Old raids for gold (Cata until WoD are very good gold pools)
Doing Gold emissaries and gold missions (2k reward per emissarie)
Doing isles and selling the rewards(razorfin sells for a lot on my server)
Praying you get the gold treasure map mission (around 5k if I recall)
Finishing a paragon rep bar (around 5k)