creepyspiders

I read some of the other posts but I'm a little confused. I signed up yesterday and within 30 minutes I was able to log into cpanel. Does this mean everything has gone through and I'm ready to move my DNS? Do I need to contact my old web hosting service and ask them to move my DNS or is there something else I do? (I thought I read that I was going to get an email telling what to do once I was signed up.) Thanks for the help.