Forget about Jupe core and guardians, dungeons and crafting.
All you need - some start capital / kupo nuts.
Just sit in Mall Hall: change 2 vaz into 2b zeny - buy from NPC DKupo 52 psc - drop all remain 50m zeny into bank (ctr + B) - repeat
Cost of 30k DKupo 25 - 22 ndc you buy it just for 1250 vaz with discount. Sell ndc for vaz and repeat. Pure profit 10-15 ndc.