Most products will work really well, so it's hard to actually make a bad choice. So don't worry, no matter what you end up picking, you should be able to get good results with.
That being said, I would not go with an AIO if I were you. AIO are great for detailers because it allows us to cut down the amount of time it takes to detail a car, allowing us to have better prices and do more cars. As the owner the the vehicle, your focus should be be on saving 3 hours on the detail, it should be to get the paint in great shape and then protect it well.
So here are my advices, you can take them with a grain of salt, I am sure any advice you get here will be just as good:
Cleaning: That is an important step, just make sure you use a good quality car soap, I am not even gonna recommend a brand, to me they all work decently and the differences are minimal. Make sure you use one that doesn't contain a wax though, all you want is the cleaning power.
Paint correction: This is where you will need to decide how aggressive you want to be. Are you gonna hand wash the car yourself and insure proper maintenance or do you plan on using the car wash on a regular basis? If you are committed to do all the work yourself and learn the proper techniques and use the proper tools, then by all mean go for a paint correction. The easiest product I can recommend is Meguiar's Ultimate Compound. Then as a polishing step, Meguiar's Ultimate Polish. If you are not gonna do the maintenance yourself, don't waste your time doing a paint correction, your paint will be in as bad a shape as it is now in only 2 or 3 visits to the car wash. So I would suggest you simply do a polishing to restore the shine and remove most of the swirls. Again Ultimate Polish is a great product to do that.
Pads: There are several good options available, the HF DA should not be too picky on what you use. For ease of use I would recommend Buff and Shine flat pads. You will need a few: Orange ones to do the compounding, White ones to do the polishing and Red Ones to do the Last Step Product (wax/sealant).
Compound/polish cleanup product: When you polish you need something to remove the residue and oils from the paint. You can buy a pre-made product like CarPro eracer or you can make your own. I suggest you go that route: 1 bottle of 70% Isopropyl alcohol, 3 bottles of Distilled water, a little bit of Optimum No-Rinse & shine (this helps lubricity and protects the paint from marring from the microfiber towel while you wipe the residue away).
Then you have to choose the protection you want to apply. I would recommend a coating. McKee's 37 coating is inexpensive and easy to use. Should give you about 2 years of protection. You can also use a spray sealant to top it everytime you wash the car: 3 options: Meguiar's Detailer's Quick Spray wax (cheapest on the list and amazing product), CarPro Reload (Shine on that sealant is pretty awesome and the protection is much better than Meg's product but it's a lot more expensive), CarPro Hydro2 (this one is sprayed on, then rinsed away. Amazing to protect every nook and cranny including mags, wiper arms with no effort. Protection is similar to Meg's QSW and price similar to Reload).
I don't think I forgot anything. Happy shopping
