Don't get carried away. Anytime I hear someone asking questions like this and even considering wet sanding I cringe. Not that you couldn't pull it off, but it is often far more involved and has far more risk than the inexperienced person realizes.
Without more information the answers you will get are no more specific than you would find in 5 minutes of searching. Let's see if we can narrow things down a bit.
What year, make, model, mileage and color car are we talking about?
What machine are you going to use or will this be by hand?
Do you have any products on hand that you might be able to work with or will you be purchasing?
Where is the car parked regularly? Outside 24/7 or garaged?
Is this a daily driver? Weekend car?
What is your wash routine? How much time are you willing to invest in maintenance afterward?
