Here "him" refers to God. The abstract nouns "dominion" and "fear" can be stated as verbs. AT: "God rules over all and people should fear only him" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Bildad uses this question to emphasize how great God is. The implicit answer is "no." This refers to the armies of God's angels. AT: "There is no end to the number of angels in his army." or "His armies are so big that no one can count them." (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-metonymy]])
Bildad uses this question to emphasize that God gives light to every person. AT: "There is no one upon whom his light does not shine." or "God makes his light shine over everyone." (See: [[rc://en/ta/man/translate/figs-rquestion]])