* "Its" vs. "It's": "Its" is a possessive pronoun (like "his" or "her"). "It's" is a contraction of "it is." You should use "It's" in this sentence.
* "Going to be": While not grammatically incorrect, it's a bit clunky. You can simplify this phrase.
Here are some ways to correct the sentence:
* "It's going to be good for me tonight." (This is the most direct correction.)
* "It's going to be a good night for me." (This adds a bit more detail.)
* "I'm going to have a good night." (This is shorter and more concise.)