Here’s where the Creed and the other prayers go. You start with the Sign of the Cross, then the Creed, then an Our Father (traditionally this is said for the Holy Father), then three Hail Marys (traditionally these are said for an increase in Faith, Hope and Charity) and then the Glory Be, then get started on the decades.
If you wish to say the Fatima Prayer, it is said on the bead of each Glory Be, immediately after each Glory Be.
After the end of the fifth decade, you may close with a Hail Holy Queen on the “heart shaped” center piece shown in the picture. If you wish, you may also say the rosary closing prayer on the cross; the closing prayer goes, “O God, whose only begotten Son through his life, death and resurrection has purchased for us the rewards of eternal life, grant that by meditating on these mysteries of the Most Holy Rosary of the Blessed Virgin Mary, we may imitate what they contain, and obtain what they promise, through Christ our Lord, Amen.”
Then make the ending Sign of the Cross and you’re done.
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Regarding “which mysteries”, you can say whatever mysteries you like on any day of the week. Rosaries for the Poor Souls are traditionally sorrowful, but you can say one of the other sets of mysteries too. The mysteries assigned to each day are usually used by people who are saying a rosary every day to make sure they cover all the mysteries. Like if I pray with a rosary group at church, on Monday they will say Joyful, on Tuesday they will say Sorrowful, on Wednesday Glorious, on Thursday Luminous, etc. If you’re just praying on your own you can pick which ones you want.