The ways to keep you strong and ways to fight well

Put enough food in your backpack before starting a battle. Eating food is a great way to conserve stamina, and at the same time can greatly improve your regeneration. It acts as a Stamian over time spell.
Remember that better to always keep potion in your backpack, because they can save you in a sticky situation.
Speak to NPC to take your starting quests. You will be given starting equipment like pick axe and axe once you have completed the starter quests. It is better to get these first rather than spend money to get them.
It is temping to kill all globins at a place in one go, however you are not advised to do that because your stamina seems not to support you. You have to keep a close watch on your stamina bar, avoiding going below your stamina bar. You are recommended to kill a few monsters at a time, retreat and rest up before you finish the rest.