Skills are determined by your abilities and I have a house rule that you can spend 16 points in any of the skills you choose. Below you will find a list of each attribute and which skills it governs. Your ability modifier will apply to those skills and if you are proficient in a skill you can add your proficiency bonus which as a level 3 character is +2.

[u]Strength[/u]
[list]
[*]Athletics
[/list]

[u]Dexterity[/u]
[list]
[*]Acrobatics
[*]Sleight of Hand
[*]Stealth
[/list]

[u]Constitution[/u]
[list]
[*]No skills
[/list]

[u]Intelligence[/u]
[list]
[*]Arcana
[*]History
[*]Investigation
[*]Nature
[*]Religion
[/list]

[u]Wisdom[/u]
[list]
[*]Animal Handling
[*]Insight
[*]Medicine
[*]Perception
[*]Survival
[/list]

[u]Charisma[/u]
[list]
[*]Deception
[*]Intimidation
[*]Performance
[*]Persuasion
[/list]