-Building levels in the main world is more difficult to do if you leave "Noob" island too soon. Remain at the "Noob Island" and build up until you become level 10. By that time you should have enough items gathered that the Jellies, Jelly Nut, Little Jellies, Little Chorpy, Royal Jelly and all the other creatures drop.
-Go to Seyon in Adventure Plains to get the Price Checklist quest, then go to Ulysses in Zant for decent experience. He will ask you to give his price checklist to Seyon. You can return back and forth between the two for easy experience.