At Lvl 4 take Moral Compass if you're not confident at Auto/Basic-attacking, if you are, then take Inner Fire.
At Lvl 7 take Blessed Recovery if you took Inner Fire, as you'll be more aggressive and the passive will proc a lot. If you took Moral Compass take Binding Heal as it'll likely be more relevant.
At Lvl 10 take prefered ultimate, which is most likely Holy Word: Salvation, in-case they have a good Stukov or other characters that are played well, which can interrupt this ultimate, take Lightbomb.