Do you have experience playing any other instruments?
If you do, you can get fundamentals like reading music, rhythm, and intonation out of the way. Intonation won't be too much of an issue on the guitar, but as a classically trained violinist, I can say that it was a major hurdle for me.
Good call on getting a $100 guitar for now. I've seen too many aspiring musicians give up on an instrument in a few months. Sadly you really can't say whether you might quit or not at this point.
Guitar is probably the easiest instrument to learn right away and make good sounding music, provided you learn a rudimentary knowledge of chords, strumming, etc. I think this would be fine for worship music.
Or, you can take the road less traveled, and learn as much as you can about guitar technique. It goes pretty deep. Learning stuff like different jazz styles, for example, can help you become a better musician overall. Plus, you can learn fun stuff like fingerstyle, shredding etc.
Good luck on your journey!