How do you recommend testing this out? privately send links to others to put it on the website?
If you're referring to the public page, you or your team can make it live and do a test registration to be sure you're satisfied with the entire process: what's displayed on the page and in the emails, the appropriate confirmation emails are received, and so forth.
Once you're satisfied, you can start sharing the link however you like; church website, bulletin, social media, etc.
Customer support service by UserEcho