Well light clerics get medium armor so you want a 14 dex, 16 con, 16 wis, at the start everything else doesn't matter.
So Str 10 (2pts), Dex 14 (7pts), Con 14 (7pts), Wis 15 (9pts), Int 10 (2pts), Cha 8 (0 pts). You can place the 8 in strength or intelligence if you prefer depending on how important those types of ability checks are for you.
This will max out you Wis for spellcasting, your Con for H.P and concentration checks, and give you your best AC.