Heater and timer

Hi I am looking at the 85kBTU raypack heat pump for my 21 above ground pool first I want to make sure it is the right size I am in Rhode Island. Also I am looking at upgrading to a variable speed pump. I just want to make sure that everything will run together properly. I have a Hayward aquatrol RJ. Do I need anything special for a time clock like an upgrade to automation? Or will everything function together with a regular time clock?

also what pump and other equipment would be recommended.

Thank you