1. you have to play a whole bunch of mini games, so you gotta improve to get 1000 NP each game
2. just check shop wizard for the prices on neggs, imo i think its better just to sell them
3. do quest, do snow fairy quest, spend only if the cost of such item is 6000 or lesss, you might get a rare item in which you cn sell to 2000-11000 or more if your lucky, sell it lower than others if you want your thing to be bought
4. quest like illusen can help you get money, if you complete 35 you get honey potion which you can sell, although its gonna cost alot and you may even fail
5. neo quest 2, beast easy, medium and hard and seel the ithems, in the highest difficulty, you can only get the item once, after wards just play the second idfficulty, bea the game and sell the item
6. get more than 1 account, stack up your np and dont get caught or so
etc etc