Calculating values from transistor to fireworks igniter

Other Hardware General Electronics
4

I'm very happy to work through the math of this, but we need to establish:

  1. how many igniters you want to operate simultaneously;
  2. how many igniters you want to switch in rapide succession, (say, with less than 500ms between firing); and
  3. precisely which 9V battery types you plan to use.