[Unwise]

1. Start with every province.

Easy, but ulimately fruitless as the game will end on turn 2. Much better to have a map where you own some large proportion of the sites but have indies in a number of others where your dominion won't overwhelm them for a number of turns.

2. Place magic sites on the map.

Again, fairly simple. You could even set it so you start with some ludicrous number in your home site.

3. Start commanders in province with gems.

As stated in the thread below.

4. Start magic sites in home province

Easy.

5. Have global enchantments cast.

Dunno if this can be at the start of the game.

6. Having a (free, if possible) rainbowmage with 4 of every path

Not tough.

You could also set it up so that certain spells are "pre-researched" for a particular nation.