you are not humanoid. Most armour will not fit you, but a smith may still be able to make armour for you for double the normal price. Magic armour will still resize to fit you

Your DEX score increases by 2, and your INT score increases by 1.

the Awakened snake at its core, its still just a common snake, as such their size is small

your base walking speed is 30, also you have a swimming speed of 15

Your fanged maw is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to 1d6 + your DEX modifier, instead of the bludgeoning damage normal for an unarmed strike.

You can speak, read, and write Common and Thieve's Cant

you gain proficiency in the following: Stealth and Poisoners tools

you can innately cast the cantrip mage hand to summon two hands which you can use to wield weapons or interact with items / people akin to how normal hands would, however these hands can not travel more than 5 feet in any direction away from the body of the caster

you may also cast speak with animals an unlimited number of times however this can only be used to speak with snakes or snake-like creatures.

you gain blindsight out to 10ft as well as tremorsense also out to 10ft