It's all about practice, practice, practice.
A good teacher is a good investment, but if you don't have the money, then grab a metronome & do what ambient said.
When playing at home or with the band, count the beats. If you don't know the time signature, ask someone. With worship music, a song is most likely 3/4, 4/4 or 12/8.
Youtube is a good place to learn things too.
And until you're ready, ask the WL to avoid songs with hard basslines such as "Salvation is here"