I was wondering the same thing.
Everybody talks about Ong farming, ong farming, ong famring
But they really mean Ong POWERfarming, I still haven't seen an Ong FARMING (just farming, not powerfarming) guide yet.
So I just assumed that there is not such thing, I guess Ongs are just for powerfarm... You just can't do it by yourself...
That's what I think...
SOOOO I am farming in Bandit's Stronghold at lvl 16

which is what I fully recommend you if you are starting a Chinese char.
Full int gear (2 or 3 int per piece) along with a +3 SoS Bow for lvl 16 and you will 1 Hit 97% of all Bandit Archers (If you are int based, and u have placed most of your stat points in Int in those 16 lvls) and of course a 9 gap.
You add premium, skill ticket and an ability pet and u get 1 SP per kill, which means 1 SP per Hit (mostly), find a nice spot and u get a lot of SP.
good luck