Your Strength score increases by 1, Intelligence increases by 1.

Darkvision 60ft

You may learn 3,  0-second level spells within your dragon type. 

Black - Acid

Blue - Lightning 

Brass- Fire

Bronze- Lightning

Copper- Acid

Gold- Fire

Green-  Poison 

Red- Fire

Silver- Cold

White- Cold

Damage Resistance
You have resistance to the damage type associated with your dragon nature

Common, Draconic, one of your choice.

It need not be gold, or magically imbued but dragons have the inherent desire to collect treasures in all their forms.  

Dragon Hatchling- Transformation levels 1

Dragon Wyrmling- Transformation levels 2-3

Guard Drake- Transformation levels 3-5

Young Dragon- Transformation levels  5-15

Adult Dragon- Transformation levels 15-20 

If your hp drops to zero in dragon form it counts as a real death and you must make a death saving throw due to it being your real form. Reversely if you drop to zero in human form you lose control and the human form drops. You turn into dragon form with a quarter of dragon health. 

Transforming into your dragon form is not a problem, its turning back into your humanoid form that is. Must make a constitution & intelligence saving throw of 10 at levels 1-5, 13 at levels 5-10, and 15 at levels 10-20 to transform back into a humanoid.