"wa'waQ Hol vIchenmoH."
Translation:Next month, I am going to create a language.
In general we encourage keeping parts of the sentence in the same order unless there is a grammatical reason to change the order. However, since Klingon requires the time stamp to go at the front and there is no way to indicate a sentence with the time stamp at the end, I have added that variation as a possibility in the English on this sentence.
"In one month" should be fine and I have added it. We actually had "in one month" in a sentence using a different order and "in one month's time" in the sentence closest to yours, but now I've added "in one month" to that sentence too. As for the moH, while your translation is a literal interpretation of the Klingon, it's a very odd thing to say in English.