When determining your character’s ability scores, increase one of those scores by 2 and a different score by 1, or increase three different scores by 1. Follow this rule regardless of the method you use to determine the scores, such as rolling or point buy.

The “Quick Build” section for your character’s class offers suggestions on which scores to increase. You’re free to follow those suggestions or to ignore them. Whichever scores you decide to increase, none of the scores can be raised above 20.

Your character can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. The Player’s Handbook offers a list of widespread languages to choose from. The DM is free to add or remove languages from that list for a particular campaign.

Every creature in D&D, including every player character, has a special tag in the rules that identifies the type of creature they are. 

You are a Fey.

You are Small.

Your walking speed is 30 feet.

Yordles often wield weapons larger than themselves. They can do so with no impearment due to size.

Yordles can change their appearance at will. This allows them to keep the existence of their kind a secret.
You may cast Disguise self at will.
When you do so it has a duration of 24h and you can't cast it this way until you finish a short rest.

Yordles hate having their freedom restrained. You gain advantage on throws to break free.

Yordles have advantage on saving throws against being charmed, and magic can't put Yordles to sleep.