Please List all your error messages and what you did to fix them.

FATAL ERROR: Too many >

What causes this and how can I fix it...

I started just adding an Intro to my game I got 4 errors, then I removed some cr's and got down to 1 error, did the same and it went back to top of intro with all new error.

Code:
startscript {
msg <Welcome, brave and adventurous one, to the wondrous and magical game of Kyrandia, Fantasy World of Legends!! You are about to journey to a fantasy land far, far away... a land of swords and sorcery where the only limit is your own imagination.

However, before you begin your adventure, here's a brief explanation of how to play>
wait <press any key...>


Error Now is:
FATAL ERROR: Too many > in You will run across many exciting characters and travel through breathtaking scenery. Beyond that, explore this great world to find what is hidden for you. The first player to reach the end will be granted the title of "Arch-Mage of Legends.">

Help driving me Looooooony

startscript {
    msg <Welcome, brave and adventurous one, to the wondrous and magical game of Kyrandia, Fantasy World of Legends!! You are about to journey to a fantasy land far, far away... a land of swords and sorcery where the only limit is your own imagination. However, before you begin your adventure, here's a brief explanation of how to play>
    wait <press any key...>
}

That will work.

If you want the carriage returns, then add "|n|n" in there;

startscript {
    msg <Welcome, brave and adventurous one, to the wondrous and magical game of Kyrandia, Fantasy World of Legends!! You are about to  journey to a fantasy land far, far away... a land of swords and sorcery where the only limit is your own imagination.|n|nHowever, before you begin your adventure, here's a brief explanation of how to play>
    wait <press any key...>
}

If you want it to look nicer, try;

startscript {
    msg <Welcome, brave and adventurous one, to the wondrous and magical game of Kyrandia, Fantasy World of Legends!! You are about to journey to a fantasy land far, far away... a land of swords and sorcery where the only limit is your own imagination._
|n_
|n_
However, before you begin your adventure, here's a brief explanation of how to play>
    wait <press any key...>
}

Does Quest still require you to use |n to start a new line? Is there any reason it opts for this instead of <br> or simply pressing return?

You can just press Enter when creating a script in QDK.

It gets converted to "|n" in the ASL file, as otherwise the line would be split.

It's personal opinion if you consider it correct or not.

I personally think that having |n is fair enough..

<br> isn't possible as the <>'s are used as a main part of ASL.