Is this right for wiring?

14 gauge with 2 wires for lights and small appliances power outlets to
a 20 amp breaker
12 gauge with 3 wires for the fridge, microwave, diswaher to a 20 AMP
breaker
8 gauge with 3 wires for the stove top, oven, dryer to a 40 Amp breaker

New panel size - do I add up the number of circuits needed and their
amps? e.g.

stove 40AMP + oven 40+ dryer 40+ light circuit 20 + small appliances
20+ fridge 20+ diswasher microwave garbage disposal 20 for a total of
200 AMP box needed? OR can I combine the stope top and oven for a
total of 160???

Thanks for your help