1. Do you mean making the animation go faster or faster map progress? The first is just opening the "Options" menu and make the movements fast/instant. The second is using mounted units or getting promotions and avoid armor knights at all costs,
2. Keep characters adjacent to eachothers for some turns, boom, support. Support bonuses are slightly more complicated though.
3. Every point of Mag gives one extra healing.
4. How did you end up with that sum? Arena? Either way, stick to Iron weapons for the most part and have some steel/silver weapons in the back for those units that doesn't lose Attack Speed from said items.