Optimal Breaker Configuration for Split Phase Mains Power
In North America, the normal domestic breaker panel will carry both "phases" of the 120/240 volt supply.  The panel is arranged so that a single pole breaker will deliver 120 volts from one of the two "hot" wires depending on its position in the panel, while a two pole breaker will deliver 240 volts, as it will pick up both "hot" wires.

If the incoming main circuit breaker is 100 Amp, it will deliver 100 amp on each "hot" wire, to allow a total of 200 amps at 120 volts (if evenly split between phases), or some mix of 120 volt and 240 volt, with a maximum load on either phase of 100 Amps.

You should look for web sites or videos covering North American (or just American - most people ignore us Canadians) electrical codes and wiring practices.

As @Samuel suggests, DIY.SE will have lots of Q&amp;A on house wiring that should help you with your proposal.