Basic Combos/Strings

1. (~0%) Side B -> Dair -> A follow-up, there are a few moves that can work in this spot, like Nair or Fair. Be aware that some follow-ups may not work on stages with platforms.

 

2. (15+%) Side B -> Up-Air (x2 or x3/4)

This is a basic string that can bring your opponent to higher percents easy. I recommend binding jump to ZL or ZR if you use the stick for aerials. 
Also can use up throw or up tilt to start depending on the situation.

 

3. (Versatile percentage range) Side B (which has been active for a longer time) -> A follow-up like Nair or Fair.

Having the Side B out for a longer period of time launches the opponent forward rather than up.

 

4. (~80%)(Kill Confirm) Side B -> Up-B Hammer Swing.