Creating a basic fighter kit mod?

Hello,

I've just recently bought BG:EE and I'm really excited to start my first character. I have played through Baldur's Gate 2 maybe three times in the past but I never managed to get beyond the chapter 1 in the original Baldur's Gate game. Not sure why I never finished it, but I'm ready to do so with the new Enhanced edition.

In Baldur's Gate 2 I played a vanilla fighter once, a chevalier paladin once and a swashbuckler thief once. I enjoyed them all about equally, but I always felt that that the fighter was a bit boring, as in 'not special', since he wasn't kitted. I did try a Wizard slayer fighter once, since I love the concept, but the restrictions of not being able to use magic items other than weapons and armor was just too severe. Sure, it was playable, but in the end I didn't feel like my PC was pulling his own, instead Minsc and Keldorn were the ones dishing out the melee damage and soaking up the damage.

So, I was now hoping to make a fighter in the Enhanced edition, but I don't want to make a vanilla fighter. The concept of the Berserker or the Kensai really don't interest me either.

My only other option therefore comes down to building and modding my own kit.

So, my question is this: Would it be possible to make a kit similar to this?

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GUARDIAN

The guardian is a fighter that has devoted himself to defending others from harm, standing on the frontlines of battle and throwing himself in harm's way. Stalwart and sturdy, the guardian stands as a wall between his allies and the enemy.

Advantages:
Bonus +1 to AC.
Another +1 to AC for every 5 levels.

Disadvantages:
May not use missile weapons.

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It might be bit overpowered, so I would welcome any suggestions as to how to give it some other restrictions. Maybe allow it to only use 'one handed weapons and shield-combo'. Take away the ability to dual-wield and use two-handed weapons.

Either way, would it be possible to create a fighter kit like this? What programs would I need to do this and are there any good tutorials on how to make a basic fighter kit? I'm fairly new to modding, but I would really like to learn and have the option to create new and fun kits.