For tips, I'd suggest training your sprites to have their skill levels near your level. Though you can buy sprite summons from the Auctionhouse npcs, dark sprites, altars and etc.
Also when the sprite comes back from gathering materials with Mineral Orders (Jale-Mining skill), Magic Academy Orders (llya-Foraging skill), or the Order scroll from Kaslow (hunting skill), be sure to complete those. It is much easier to gain fames from those three at a lower level. With those fames, you can then purchase Talents and other equipments from the npcs: Iron Stone Association Cashier -Hatt (Jale), Magic Academy Cashier -Noe (llya), and Treasure Appraisal Committee Cashier - Andre (Kaslow)
You can also check out the Grand Fantasia Wiki
page for info on drops/monsters/other things.