I am not sure which style do you learn? As far as we know, there are two main styles of ballroom dancing: American and international. Some body say that: American style is used more often for social dancing while International style is used primarily in competitions. We are familiar with International style but in social dancing . In International style, there are 5 dances for Standard - Waltz, Tango, Viennese Waltz, Foxtrot, Quickstep and 5 dances for Latin - Chachacha, Samba, Rumba, Paso Doble, and Jive.
As our experiences, for this style, the first dance we learn: for Standard - Waltz then Quickstep, for Latin - Rumba then Chachacha. We do not know which is first dance in American style.

We hope this helps.
HaOanhTranThanh