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P0304 and P0030 Codes pulled, need help.

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To set things clear, my car is a 2004 Impreza RS, ~196,000 KM (not miles), only mods done are UEL Headers and a Tsudo Catback.

To my problem, I was out driving last night, pulled to a stop light, as I accelerated, I noticed my car stutter/jerk during mild-heavy accelerations. No CEL at the time, but about 10 mins later, boop, CEL turns on. Pulled the codes this morning and got a P0304 (Misfire on Cylinder 4) and a P0030 (O2 Sensor Heater Circuit Range/Performance Bank 1 Sensor 1).

My question is where should I start? I think I'm going to try replacing the spark plugs and wires tonight and go from there. Any advice would be helpful from the vets!

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