If you have the AG SRP then use it. I just would not recommend it as it is a pia to use and really dosn't last especially considering the effort required. Just make sure you cover it with a good quality wax as it washes out over time and this will protecct it a bit more. Something like Collinite or Megs 16 Paste Wax are very durable. Nxt won't last and you will be doing it again after the first rain shower.
To get it looking good depends on how much you want to spend. First of all don't take any advice from someone telling you to use a water blade to avoid the water spots, they do untold damage which keeps me busy at the weekends but you don't want to pay for paint correction if you don't need to. Bin the thing, I wouldn't even relegate it to windows as a scratch is a scratch where ever it is.Use a good quality drying towel like the Sonus der wunder mentioned earlier. As an aid you can spary with Megs last Touch which contains traces of wax and aids lubrication, oo er and will also
help break the surface tension of the water . Also a water filter will work get one that is 0ppm rated and don't run the hose pipe through it. Fill a watering can and rinse the car over with that. A couple of cans and you should be fine, leaves no water spots and almost dries itself. Using the watering can prolongs the life of the filter as they are about £45 you want it to last. Also needs to be kept in the dark to avoid damaging the orgainc componenets inside.
Have a look at Detailing World if only for the traders as they are far better than Halfrauds and you will get much better advice.
Wash mitts are better than the old sponge but have been superceeded by the Schmitt, which is a high density foam sponge but nothing like a traditional one. You can see the dirt trapped on them and when rinsed can see if it is all gone unlike a mitt. They also hold a lot more water than a mitt. Don't worry though I could go on for ages and do you a product list running into hundreds of pounds but not sure how serious you are so will leave it at that for the minute.