Questions about polishing car

Is it necessary to apply something like nufinish, then jescar powerlock, then collinite 845 wax if I want to keep my car finish durable? Or can I just apply nufinish or the last two instead and be done with it? It's for a Nissan Sentra 2007 S Silver. Would there be any advanted of way over the other or what do you reccomend guys? Thanks!

while my brother, the paint and body (and detailer) guy, would recommend mopar compound and a high speed buffer; i am more of a meguiar's and mother guy..
and mother's makes a one step cleaner/paste wax that is less expensive than your nu- finish, jescar, collinite; 3-step process.. you can still go to that extreme, but anything is better than nothing; so even if you just use NuFinish, that is better than just a car wash, and nothing..
and if you are planning on doing it by hand (one and done, or 3 different applications), get a $12-25 orbital.. you'll thank yourself in time; and shoulder/elbow aches..