簡単な紹介　（自己紹介 would be more common than just 紹介.)

こんにちは！わたしの名前はエミリーです。

Very good! Your writing was fully understandable and there were no major mistakes . You can also say as follows:

・私はエミリーといいます。

・私はエミリーともうします。(more polite)

Keep up the good work!