Join the local church choir, and also get vocals lessons from a pro. You need to ensure your pitch is correct and be able to modulate your voice during the singing runs. See how they do it in The Voice (TV) for example. Lots of good coaches that you can view from afar. However it's all about practice, practice and more practice to get better. You should be evaluated at some point to ensure you are headed down the road to become a singer.
Enjoy singing your heart out!