I don’t think there’s a right or wrong way to pray. Speak from your heart. If it helps for you to know some of the saints prayers, here are a few from a book on Novenas:
O Saint Agatha, who withstood the unw4elcome advances from unwanted suitors, and suffered pain and torture for your devotion to our Lord, we celebrate your faith, dignity, and martyrdom. Protect us against rape and other violations, guard us against breast cancer and other afflictions of women, and inspire us to overcome adversity. O Saint Agatha, virgin and martyr, mercifully grant that we who venerate your sacrifice may recieve your intercession. Amen (mention your request)
O glorious St Joseph, faithful follower of Jesus Christ, to you we raise our hearts and hands to ask your powerful intercession in obtaining from the compassionate heart of Jesus all the helps and graces necessary for our spiritual and temporal welfare, particularly the grace of a happy death, and the special grace for which we now ask (mention your request). O guardian of the Word Incarnate, we feel animated with confidence that your prayers for us will be graciously heard at the throne of God. O glorious St Joseph, through the love you bear for Jesus Christ, and for the glory of his name, hear our prayers and grant our petitions.
You can do a search on line for novenas or for prayers to Saints and get many more. If you have a specific intention, find a saint who is the patron of that intention and look for a prayer to them. But don’t feel that you must say specific words. It’s what’s in your heart that is most important.
Hope that helps!