Acquaint now thyself with him, and be at peace: thereby good shall come unto thee.
Eliphaz takes it for granted, Job is not yet 'acquainted' with God; literally, become a companion of God. Turn with familiar confidence to God.
And be - so thou shalt be. The second imperative expresses the consequence of obeying the first (Psalms 37:27).
Peace - prosperity and restoration to Job; true, spiritually, also to us (Romans 5:1; Colossians 1:20).
Good - (1 Timothy 4:8).