1. You're confusing your classes a bit here. At the beginning of the game you can choose Soldier, Scout, or Scoundrel. At a later point, you will choose Guardian, Sentential, or Consular. Therefore, you could theoretically be both a Soldier and a Consular. If you want to own with lightsabers on the second time through, the most extreme duelist would be a Soldier Guardian.
2. Wisdom determines how hard it is for others to resist your force powers, and how well you resist other's powers. I wouldn't max it out though - that would leave you wide open in other areas. Soldiers are generally going to fight with lightsabers more than the force, so 12 should be more than enough.
3. Difficult to say. However, you should know that (especially for types such as Consulars) DEX can be quite useful. A character with a high DEX can dance through a fight and never get hit - quite useful for Consulars, considering that they can then just stand there and fry everyone with Force Lightning. CHA, aside from affecting things such as persuade, determines how many force points you have. Since Consulars aren't going to have awesome lightsaber skills, it's important not to run out of force points.
4. Personally, I'm not a big fan of awareness. There are a few times later in the game that it could be... useful... but it's not that big of a deal. I tend to have at least one character high in computer skills, since you get extra experience points for using computers instead of simply bashing your enemies, and there are lots of computers throughout the whole game. Demolitions is similar to awareness in that it will be useful in a few key spots. However, there are mines scattered through the KotOR world, so it's best to have at least one character with good Demolitions skills. Most of the other skills you can do without; you will only really need stealth once in the game, and anything with security can just be bashed open instead.