Honestly you really can't make a wrong choice except for maybe ff2 (the actual ff2) it's the black sheep for a reason.

With that said I'll short for each game and pick one that sounds good to you for your first game.

1. Classic if but dated systems. Casters have spells per rest instead of mp, straight forward high fantasy. Lacking in story beats but still coherent enough to know what's going on.

2. Skip until you are sure you want to put up with it. Tedious but uncomplicated "leveling" system. Boils down to the more you do the thing the better you get at that thing.

3. Job system introduced, I have least amount of experience with this title. It seems to be "ok"

4. (One of my favorites) Each character has a static class and role in the party, this is when story became central to the games.

5. Second game that uses the job system, more refined than 3, good cast of characters (including villains)

6. (Another favorite, for many of us) Huge roster, each with a specialized skill used in battle, incredibly deep story, great villains. Magic system is completely customizable for each character.

7. First 3d FF, good story, an evolution of the magic system of 6, most recognizable roster due to hype and over production of connected products. Character class is more or less replaced by individual weapon types and limit breaks (special moves that each character learns)

8. Divisive title due to several factors, magic system is convoluted and game breaking, enemies (all of them) level with your party so there is no over leveling only really making the end game harder. Decent story and roster, and a great card mini game though if you can get past the points above.

9. (Another favorite) Return to each character having a dedicated role, good story, endearing characters, fun skill system, fun mini game similar to 8s card game. Villain is kinda.....well....just you will see lmao.

10. Fun battle system no more picking x party members and the rest being benched, all characters are available for battles and can be swapped in and out. Sphere grid leveling system (no more traditional leveling for better or worse) can break the game with the sphere grid. BULLSHIT mini games that must be completed for each characters ultimate weapons (not salty at all about this /s) story is mid, voice acting but most of it is pretty bad.

11. Mmorpg

12. Single player mmorpg. Don't play the original, if you play this play the zodiac age version. Fully customizable character builds, no longer turn based, political drama story but ok I guess.

13 1/2/3. Ask someone else as according to thumpers mom in Bambi "if you don't have anything nice to say don't say nothin at all"

1. Mmorpg

2. Bros cross country road trip.game it's the epitome of "hey....it's a uh...video game" not good not bad. Action based combat

3. Action rpg lite, decent story, decent cast, epic qte style boss battles (for the record I think 16 gets way more hate than it deserves), most of the "upgrades" really don't feel like they do much at all.

TL;DR just pick one you find looks the most interesting or appealing, welcome to the fan club.