Well first of prayer.
Then you have to make sure if you are using a song using a certain translation that you get permission; especially if you plan to publish it.
Then let the Lord lead you and it will come.
Mercy me is not the only one to do that, in the 60's the Byrds did it with the song Turn, turn, turn, there is a direct quote form Eccles.. in there, a time for.....
Peace be with you,
John.
