I'm mostly leveled.  I get a cantrip and a spell, so I chose Mending, cause you never know when you'll need it, and Darkness.  I figure he's got an angelic nature, so he can make light leave just as easily as make it come.  And i want to focus on spells that help the party, rather than trying to charm and be a face (which is Theremin's job) or be a front line fighter like Mindra and Coriana.  Plus, Liam can see through magical darkness.  I'll try not to hurt the party with it.  
Now I just need to decide if I want an ASI or the Healer Feat.  I feel the Healer Feat could be very, very useful.  I have some healing, but it is very limited.  though, I'm looking at it now and it looks like I have a pool of dice rather than it just being once a day, like I thought.  Oh, the Aasimar's healing is once per day, the Celestial Warlock is a pool of dice I can draw from.  I should remember that.  I could have healed Mindra, rather than just trying to do a medicine check.
Point is, I've got some healing, but with a Healer Feat, I would be Healer-Man.  Or I could get my CHA up to 20 and add +1 to everything that uses it.  What do y'all think?