Answer:
Overall, this looks great, but there are a few minor errors that can easily be fixed. I'll fix some problems with the bold and <em>italic</em> fonts:
Explanation:
Original text: "Oh <em>yea</em>," Josh says<em>,</em> "I forgot to mention <em>i'm</em> throwing a little gathering with some people you and I know, so get comfortable because tonight is going to be one hell of a night."
The word "<em>yea</em>," is usually spelled like this in an informal text, but if you are writing a story/essay, use the correct form of this word as, "<em>Yeah."</em>
Also, after your quoted text, you write, <em>"Josh says,..." </em>and for this, you would need to replace the comma (,) with a period (.) because these are two separate independent sentences. So it would be, "<em>Josh says." </em>
And then, in the second sentence, you need to capitalize, "<em>i'm</em>," since it is a proper noun that the subject is using. So, it would be, "<em>I'm</em>."
And, if needed, you can split the second quotation text into two sentences by replacing the comma beside the word, "<em>know</em>," with a period, and then you should capitalize and add a comma beside to the word, "<em>so,"</em> since it is the beginning of a new sentence. But, if you want, you can keep it as it is.
<u>So, your text should be written as the following:</u>
"Oh <em>yeah</em>," Josh says<em>.</em> "I forgot to mention <em>I'm</em> throwing a little gathering with some people you and I know<em>. So,</em> get comfortable because tonight is going to be one hell of a night."
I hope this improves your work. Let me know if all goes well! :D