New characters are considered to be young and have had very little experience in the world
Experience: New characters are considered to be young and have had very little experience in the world. By vanquishing monsters and completing RS Gold quests, your character grows (meaning, gains experience).
As you kill monsters and complete tasks and quests, you may be awarded a certain amount of experience (some quests will only include an item reward, though most include either an XP award or both).
The experience is reflected in the two blue bars in the target panel. The topmost of the two bars is segmented into 10 bubbles. Each bubble represents 10% of your total experience for that level. When all 10 bubbles (100%) fill up, you will gain a level, and the bar will clear and begin again. When the non-segmented blue bar fills, you will fill one bubble.
With each level, your character will gain more health and power. You will also gain points in your primary, secondary and tertiary attributes, and you will be awarded specialization points (based on your character class).
These skill points are used to specialize in the various skills your character has available to it. You may also receive new abilities when you level, such as the ability to wear a different type of armor, evade, or parry.
Each time you level, you will get less experience from the monsters you fought the previous level. They will be easier to kill, but will be worth less, relative to your current level. If a monster cons gray to you, you will gain no experience from it at all.