Practice Session vs. Live

Hello,

I couldn't find a place to start my live webinar today so I started it in practice mode.  I had my husband test it and it also said that people could begin loggin in once I started.  I had 19 signed up but nobody attended.  I know it's possible that maybe they just signed up and didn't show, but I want to make sure I didn't do something wrong.  If I start my webinar in practice mode will attendees still be able to log in?  I couldn't find the answer on the support site.  Any help is appreciated.  Thanks in advance!