Hosting a meeting - basic issues

Hi, is it possible for me to host meetings with zoom with a simple link that I always use for all my clients, and just send it to whoever I want without specifying a time anywhere and I just let in people from the waiting area as they arrive?

I thought this was what I was doing but it often doesn't always work.

*Sometimes the participants tell me there is a time on the meeting (that I don't know how to delete)?

*Or they see a message saying 'waiting for the host to start the meeting' despite me already being there.

*Othertimes I get an email saying he participant is waiting for me to join, despite me being in the zoom meeting alone already.  Then I log out and use the link in the email which seems to work eventually but is unprofessional.

Can anyone help keep this extremely simple for me?  Jen