Letters and numbers in row

To align the numbers to the right, you'll need to run a fastloop the numbers of times needed. Run the loop 15 - length(string) times. In the case of abcdeft that would make it loop 8 times. On each loop you add " " to the string. Then, you add the number.

LETTERS + right$( "FIFTEEN_SPACES" + NUMBERS, 15 - len( LETTERS ))

I couldn't write it because the forums remove whitespace from posts, but "FIFTEEN_SPACES" should literally be a string containing fifteen space characters.

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You don't need any loops.

That's not a monospaced font that you're using. You need to use a font where all characters (including spaces) are exactly the same width - in most fonts, a "W" character is very much wider than an "i" character, for example.
In my example, I changed the font to "Courier", but there are plenty of others to choose from (I believe "Consolas" and "Lucida Console" come pre-installed on Windows systems).

eg. If you had two players, with the names:

Jill
Emma

They're both 4 letters long, but you'd have to add another SIX spaces (spaces are also very narrow characters) onto the end of "Jill" before it takes up as much screen space as "Emma".

With monospaced fonts, this is not an issue, as all characters are of equal width. The downside is that there's less variety in monospaced fonts, and they tend to be pretty ugly a lot of the time:
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Just look at how the "m" has been squished and the "i" has gained those strange serifs. On the other hand, you can't get much more retro-futuristic than OCR-A ( Please login to see this link. ), if that's the aesthetic you're going for...

One thing I would say is that you may actually be better off displaying each list entry as two separate string objects, with the name left-aligned, and the score right-aligned. It would give you more control over fonts and positioning.