... Don't play a "Warlock playing my kitty avatar's Tail" ?!
that's a low charisma build , regardless
There is a Warlock handbook back at wotc, though
it's so early that I doubt it's long term providence.
Cha 17 ... Wis, Dex, Con 14 ... Str, Int 12
Warlock 4 / dip Cleric 1 / Warlock 5+
Actor feat at level 4, for the +1 with smidge of out of combat.
+2 Cha at level 8.
Yeah I can see War Caster at level 1.
Maybe switch this up with Actor at level 1
Warlock 3 / Cleric 1 / Warlock 4+
War Caster at warlock level 4, since you'd have a shield by then.
Aim for the fancier Medium Armors during mid levels.
+2 Cha at level 8 ... (this has turned into virtually stock advice).
Spell Sniper is a good idea. As is Alert.
idk if the Polearm Master combo is as good an idea as so far advertised.
iirc - the short section before the phb backgrounds,
has a short blurb on customizing your background.