I have found a site that may explain somethings i do not and will be able to help you with the Grammar of your language.
So some things we will have to do are as follows:
-Alphabet (doesnt have to have english characters)
-and what ever else you think will help make this unique
I am of no way held responsible for anything that may or may not happen to you using your own language........i dearly apologize if you are abducted by 9 ft tall blue people, get slapped by your girlfriend cause of mistranslation or if you are beleived to be possesed by your Crazy Great Aunt......please use these tools responsibly.
now then, lets move on......
Step 1: The Alphabet
Haha this part is quite literaly easy as abc.....
All you have to do is choose how many vowels you want, how many constanants you want and write/draw out the symbols. In Frommer's Na'vi there are words with two characters instead of one like "aw" or "kx" these can be created to make one letter (vowel or constonant) for your language.Note this can vary the complexity of your Language, for example: in english "c" and "k" can both make the same sounds and "c" and "s" can make the same sounds so the need for "c" is not entirely needed. It can also vary the complexity in that you can have one letter for every sound you can think of or maybe some, like "c" can share sounds.....with that in mind you could have a 100 letter alphabet or mabey only a 15 letter alphabet, what ever you decide.
I know this seems like a lot so take your time and when your ready continue on.........