membership auto renewal after free trial

Screen shot of how I have the membership level set up:
This is supposed to be set up to give the member a 30 day free listing and then to automatically renew on the 31st day charging them. I had the 2nd level set at indefinite but it did not charge the person when the month was set up, instead it kept the member at the free membership level. I just changed the 2nd step of membership to serial (as in the link above) is that the level it needs to be in order for the system to make it a recurring payment? Please advise asap. thanks