First, you can start preparing the lyrics of the hymn. Usually, the lyrics of hymns have a clear rhythm and prosodic pattern. You can read the lyrics to get familiar with these elements.
Next, you'd better practice your vocal music before singing hymns. Make sure that your voice is in good condition and master some basic singing skills, such as breathing correctly and pronouncing words.
When you are ready, you can choose an accompaniment or an instrument to accompany your singing. You can try to play the chords of hymns on the piano, guitar or other instruments to provide a musical background.
When singing hymns, you can try to pay attention to emotional communication. The purpose of hymns is to express praise and gratitude to God or faith, so convey such feelings through your voice and singing.
Finally, pay attention to the rhythm and change of the song. Some hymns may have different rhythms and parts. You can adjust your singing style according to the structure of the song.
I hope these suggestions will help you! But remember, the specific singing style depends on the requirements of specific hymns and music groups. If you belong to a music group or church, please discuss their singing requirements for specific songs with the tour leader or music director.