Put your personal points into SP for the yellow bar so you can escape their tummies easier, and into your health so you can survive to struggle. Buy extra, weaker weapons in case your current one is dissolved. But as you are likely to be eaten- keep every item you pick up. These will NOT neccessarily be the most expensive. Also, try to save up enough gold if you can to buy the weapons that inflict the most damage. The physical classes like Valkeryie and Amazon work better in the long run and at the short run of the begining. Also, never choose a magic class if you can help it- they are utterly pathetic in the beginning, hard to handle even later, and magic runs out pretty quickly no matter what spells you choose to use. Spamming like that helps you level up faster so you CAN go places. Just hang out and kill the monsters, then heal. Never stray too far away from one if you can help it.
Fountains are always, always your friends.