You get a +1 to Intelligence and a +1 to Charisma 

You replace your current creature type with Undead, but retain any subtypes.
You don’t require air, food, drink, or sleep.Instead, you meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

Liches use the decaying corpse of their past self as a body, your size is Medium  

Your base walking speed is 30ft

You have immunity to the poisoned condition, and to poison damage, Resistance to Cold damage and Vulnerability to Radiant damage

Your soul is bound to your phylactery. If your body is every destroyed, the phylactery begins to emit magical smoke. After 1d10 days, your body reforms in an empty space adjacent to your phylactery. If your phylactery is destroyed, you die immediately and your soul is destroyed. Nothing short of divine intervention can restore you.

You have advantage on saving
throws against any effect which turns undead

At 3rd level, as an action, you can magically terrify a creature with your gaze. Target one creature within 60 feet of you that you can see. If the target can see you, it must make a Wisdom saving throw or become frightened until the end of your next turn. The DC for this saving throw equals 8 + your Charisma modifier + your proficiency bonus.
After you use this ability, you can't use it again until you complete a short or long rest.

As an action, you may touch a creature and magically paralyze them. Make a spell attack. On a hit, the target takes 2d6 cold damage and must succeed on a Constitution saving throw or be paralyzed for 1 minute. You must maintain concentration during that time, as if you were casting a spell. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. The DC of this saving throw is 8 + your proficiency bonus + your Constitution modifier.

After you use this ability, you can't use it again until you complete long rest.

You can speak, read and write in Common and one other language of your choice. 

You can cast the Mage Hand cantrip at will