How do you install car alarm and remote starter on 2007 dodge charger base?

You must have alarm/remote start brain(s) with instuction booklet.

You need a key bypass unit, and if you want to keep your spare key you need a third one made at dealer (before installing system).

Now you need to splice alarm/remote start system into proper wires in proper locations of vehicles electrical system.

Make sure you properly understand all instructions, electric diagrams and key bypass system, if you don't... leave it to an experienced person.