The car is brand new hence my wanting specific info on sealing etc. I do have stuff like super resin polish but I was looking at something to start with on brand new factory paint.
SRP is a mixed product it has some fine cut to help reduce small swirl marks, some filling ability to fill the bigger scratches and swirls and some protection too. However it isn't comparible to doing those 3 stages individually and using 3 individually designed produtcs.
Are you looking for a wax or a sealant? Personally I prefer using a wax to a sealant however for longevity a wax doesn't come close to a sealant. If you wanted to use the SRP you have you could do and apply a dedicated wax over the top.
The problem offering advice is the products are all different and so appeal to one person or another. Personally I love using Dodo Juice Purple Haze Pro wax but it is a hard wax and some people prefer soft waxes so don't like it.
An interesting thread on detailing world asking for peoples favorite products in each job so worth looking through all of them, see here:
http://www.detailingworld.co.uk/forum/showthread.php?t=293824
Also having spent a while reading detailing world and short time posting on there the state of some new cars is terrible so depends on how your car looks when you get it what you will actually need.
Some products I would recommend though would be a good quality shampoo, making sure it isn't one that removes LSP (last stage product - usually a wax or sealant) and preferable isn't a wash and wax as don't really want that adding ontop of the LSP you already put on the car. I would also suggest a sealant for your wheels to stop and dirt or brake dust sticking to them, also means you can clean them with normal car shampoo instead of harsher wheel cleaners. I would also recomend getting some clay (personally only ever use bilt hamber) and some Iron X as the paint can get quite contaminated rolling through the factory.