This is the first mention of the priestly work of Christ, the keynote of this Epistle. Messiah seated at the right hand of God. There is no way to decide certainly about it. The inhabited earth. That is all true, but that is not the point of this passage.
Preachers also are sometimes like a wind-storm or a fire.
In the LXX, not in the Hebrew. This Messianic Psalm pictures the Son in his Creative work and in his final triumph. Perfect active common use of the perfect for permanent record. From my right. Here used of the final salvation in its consummation.