Yes, you need some sort of PA system to be heard over guitar and drums, no question. There are definitely people on here who can help you out too!
You need to be more specific before we can properly answer what a good PA system is.
What is your budget? Do you want the PA only for practice, or also for some gigs? Will you mic drums, amps, other vocals or anything in addition to your own vox?
These are a few things to consider before making such a decision. Good luck!
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