Fantasy Guide to Creating Your Own Language
When writer's set out to world-build, language has a huge role in creating new cultures and lending a sense of realism to your efforts. A world and people just feel more real when language is involved. As the old Irish proverb says "tรญr gan teanga, tรญr gan anamโ. A country without a language, is a country without a soul. So how can we create one?
First things off, you should start by studying languages. Nobody is asking you to get fluent but it's important to understand the basic mechanics of language. You will start to see certain tricks to language, how verbs are conjugated and how gender effects certain words. It will be easier to make up your own when you know these tricks. For example, in Irish one doesn't scold but "gives out to" - "a thabhairt amach". In German, numbers are arranged differently to the English with the smallest digit arranged before the tens for example 21 - Einsundzwanzig. By immersing yourself in an array of different languages (I recommend finding ones close to how you want your language to sound), you can gain the tools necessary for creating a believable language.
Nobody expects you to pull a Tolkien or channel the powers of David J. Peterson (hail bisa vala). You're not writing a dictionary of your con-lang. You will probably use only a handful of words in your story. Don't over complicate things. A reader will not be fluent in your con-lang and if they have to continually search for the meaning of words they will likely loose patience.
When you're learning a language, you always start with the basics. You do the exact same when writing one. Start with introductions, the names of simple objects, simple verbs (to be, to do, to have for example) and most importantly your pronouns (you will use these more than any other word, which is why I always start with them). Simple everyday phrases should always be taken care of first. Build your foundation and work your way up, this is a marathon not a race.
If your creating a new language, you're more than likely doing it phonetically. Sound is important to language and especially a con-lang because you want to trick your reader into thinking of a real language when reading the words on the page. I suggest sitting down and actually speak your words aloud, get the feel of them on the tongue to work out the spelling. Spellings shouldn't be too complicated, as I said before the readers aren't fluent and you want to make it easier for them to try it out themselves.
Also when you're creating the con-lang, it's important to figure out how it sounds to an unsuspecting ear. If a character is walking down a street and hears a conversation in a strange language, they will likely describe to the reader what it sounds like. It might be guttural or soft, it might be bursque or flowery. It's always interesting to compare how different languages flow in the ear.
Now that you've written your language and created some words, you will want to incoperate them into your story. The way most writers do this is by italicising them. As a reader, I generally prefer authors not to go too overboard with their con-lang. Swathes of con-lang words might intrigue a reader but it can leave them confused as well. It is better to feed con-lang to your readers bit by bit. In most published works writer's tend to use words here and there but there are few whole sentences. For example in A Game Of Thrones by George RR Martin, has actually only a handful of short sentences in Dothraki despite the language being prevalent throughout the book. Daenerys Targaryen pronounces that "Khalakka dothrae mrโanha!"/"A prince rides inside me!" and it's one of the only sentence we actually see in actual Dothraki.
There's also nothing stopping you from just saying a language has been spoken. If you're not comfortable writing out the words, then don't make yourself. A simple dialogue tag can do the trick just fine.
I do recommend keeping an actual record of your words. Make a dictionary if you want or a simple list of words you need. This is one of the most entertaining aspects of world building, have fun with it, go mad if you like. Also here's a short list of questions you can ask yourself about language in general which might help your juices flow.