Simplify.

Airspeed, and aiming point are all that matter. In a 172 in a no-wind situation I instruct my students to have 85 abeam, 75 on base and 65 on final. Pitch for airspeed, power for altitude. The other advice is really good, all too often new students focus too much on the aiming point and everything else goes to poo. If you start with a nicely trimmed plane on downwind the rest will follow with proper configuration changes.

If you're flying an older 172 with 40 degrees of flaps I'd suggest not using all of it. Try 30 instead.

Also, until you get the flare to landing down try flying a faster final approach speed (75) and staying in ground effect while your instructor shows you the proper pitch attitude.