I'd suggest making 5 gallons if you can afford it. After you drink the last bottle you are going to wish you had over twice as many! I made Edwort's apfelwein 1.5 years ago and it is really awesome now, I'm really glad I saved a few bottles.
I just made two ciders with a buddy of mine. We did about 2.7 gallons with some tasty store bought juice from Mother's Market and 1.5 gallons with juice from apples my friend pressed. With these we adjusted the pH with malic acid to get them to 3.4 or so, something I didn't do with my apfelwein (no idea what the pH was for that).
This site has some good info on how to adjust your pH and how many Campden tablets to use depending on the pH, as well as loads of other good information. I just used pH strips to measure the pH.
I prefer it carbonated - just add sugar right before bottling. I'd suggest using a bottling bucket, they really make bottling a lot easier. And just add all the sugar at once to the bottling bucket, as adding sugar to each individual bottle will likely result in uneven carbonation. Or add some carbonation tablets to each bottle - those are a lot more precise that measuring small amounts of sugar. Just use one of the many carbonation calculators you can find online to determine how much priming sugar to add.
So it sounds like you are on the right track. You will end up with a dry, crisp hard cider using these methods and yeast.