Welcome, another Canadian member!
There are many things you can do. Other members would share their recommendations.
I have a UPR Oil Catch Can installed in mine when I bought my car home. Then shortly afterwards it was the mid muffler delete (exhaust was too quiet for me). Afterwards, I had the rust-proofing spray done by Krown in the Spring when it comes out of storage (and once every Spring going forward) and then XPEL paint protection film right after that. I don't drive my vehicle in the winter time, on gravel road, or in bad weather but I'm anal about rust so I still get it rust-proof sprayed regardless.
Many forum members I'm sure would recommend a ceramic coating as one of the first things to do for your vehicle.
As for the break-in, here's the instructions for the six fours:
0 to 100 miles (0 to 161 km)
- Do not allow the engine to operate at idle for an extended period of time.
- Depress the accelerator pedal slowly and not more than halfway to avoid rapid acceleration.
- Avoid aggressive braking.
- Drive with the engine speed less than 3,500 RPM.
- Maintain vehicle speed below 55 mph (88 km/h) and observe local speed limits.
100 to 300 miles (161 to 483 km)
- Depress the accelerator pedal slowly and not more than halfway to avoid rapid acceleration in lower gears (1st to 3rd gears).
- Avoid aggressive braking.
- Drive with the engine speed less than 5,000 RPM.
- Maintain vehicle speed below 70 mph (112 km/h) and observe local speed limits.
300 to 500 miles (483 to 805 km)
- Exercise the full engine rpm range, shifting manually at higher rpms when possible.
- Do not perform sustained operation with the accelerator pedal at wide open throttle.
- Maintain vehicle speed below 85 mph (136 km/h) and observe local speed limits.
For the first 1500 miles (2414 km)
- Do not participate in track events, sport driving schools, or similar activities during the first 1500 miles (2414 km).
Not sure how accurate you would want to follow those instructions. I drive like a grandma in my Challenger so I just stayed off the freeway for my break-in.
Hope you enjoy your car! Being a new Challenger owner myself, I certainly love my car so far!