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This is for those of you who already have money, but want more, and also have some free time.
Find someone who is selling Pet Eggs, buy one or two. In Demian, this comes to about 400-600 thousand penya for 2, and 200-300 penya for 1, not sure about other servers though. This, in itself is pretty expensive for a new player, the quicker method is even more expensive, but the better, and probably more profitable way, is through the long method.
The quickest method is to buy pet food for the cheapest price you can get. This may not lead to much income in the long run though, especially if the pet you get isn't worth very much...This method is only recommended if you get Feed for a very cheap price. Simply sell the pet when it hatches, or invest in more Feed to level up your pet too!
The most expensive way is the simplest really. Follow the steps above^ to hatch your egg. Then, just get the Cash Shop Feed Bag, and get lots and lots of feed. Now, just leave your character AFK for a while, and: TA-DAH! Instead leveling for your pet!
Now, the least expensive, but the longest method, is the one that I'd say will give you the most profit. Buy an egg, or if you're even luckier, find one from a monster. Now, go train for a while. When your inventory starts to get full, or you level, head back to town. If you don't need all of your items for quests, turn all the remaining items into Feed, and level up that egg! If you don't need any of those items, turn half into Pet Feed, the other half could be sold, or turned into Pet Feed, just depends if you want extra money. If you need them all, ignore the egg for now. When your egg finally hatches, you have a few choices. You could sell it now, for instant millions, or you could raise it for a while, and get more millions later...A lot later...
The Buying to Sell Method
nice guide ^-^
some of these methods work better then most people thing they do but you might wanna add something like if your grinding and you get a (example Merr Suit) you can sell it in saint morning pretty easy on CW (clockworks)server for about 400-600k low to mid lvl greens for sale are found usually found in saint morning so like a flury set all together it'll sell for about 3-5m on CW..low to mid lvl greens have good bonuses and alot of the sets are used till around lvl 60+ so if you get one you wont use might as well sell it 
. Jk, just wanted to see that corrected since you say its 5m the whole set (I wish).
. Just need to be on the lookout for newly opened shops.
