Upkeep and upgrades questions for 2014 Chevy Impala limited police package

[olieps3]

Hi everyone, I’m new here and hoping y’all can point me in the right direction.
- is there an impala forum here?
- what standard method of upkeep based on time and mileage is good for this model?
- what are some beginner upgrade suggestions for a clean running and quicker car?

Any guidance is greatly appreciated!