How can I create a convincing fictional language like Tolkien did?

It works like cryptography, except we get to cheat.

Simply rotate vowels to the next vowel to the right in the Alphabet, and rotate Consonants to the third Consonant to the right in the alphabet.

So if the Elves wrote, "Say 'Friend' and Enter."

It would look something like this in my language:

"Wea 'Jvoirh' erh irxiv."

Now try pronouncing that!

But we can now "cheat" by breaking the cipher to make some new words easier to pronounce and look more natural. So "Jvoirh" becoems "Juvoirah" and "Irxiv" can be broken into two words "irx" and "Iv".

Anyway, have fun, it's fictional languages.

You can make Orcs sound more alien by using a lot of "Z" and "X" substitutions, which is what Tolkien did in LotR.

When you get really, really advanced, you can write a poem or song in the alien language and have it obey a real rhyme and such.

How can I create a convincing fictional language like Tolkien did?
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