Most likely if you put your lighting loads a 15 amp breaker and your cord and plug stuff on general purpose 20 amp branch circuit(s) you will be fine.
15 amp breaker = 14 awg copper wire
20 amp breaker = 12 awg copper wire.
Use 5-15r receptacles like these below for 15 amp circuits or
20 amp circuits the 5-20r is not required on a 20 amp branch circuit that serves more than one receptacle in the USA .....if in Canada I believe you must use 20 amp receptacles on 20 amp circuits and 15 amp receptacles on 15 amp circuits.
15 amp (5-15R) ... 20 amp ( 5-20R)
In the Usa and Canada....
A 15 amp branch circuit protected by a 15 amp circuit breaker will give you 1800 watts of power
A 20 amp branch circuit will give you 2400 watts of power.
It's becoming common to put entertainment equipment on its own 20 amp branch circuit.
Example.... You have 12 x 35watts = 420 watts... so you still have 1380 watts of power left on a 15 amp branch circuit. The idea here is if you approach 1800 watts of connected load and that load is all
going to frequently be on at the same time
then you need to design your circuits appropriately so you don't overload them. It is becoming more common for entertainment systems to require dedicated branch circuits because of the total load requirements. Anyway generally speaking lights on 15 and receptacles on 20 and you are usually fine.