Swing and Salsa are not ballroom.
Waltz, foxtrot, rhumba, cha cha etc are ballroom... swing and salsa are American street dances - they can be a part of the mix, but in a real ballroom dance, you might hear a swing or salsa every 1/2 hour or so.
You'll do well to find a dj from the local dance studio to provide the music. And a month is not enough time to instruct more than a basic movement or two.