There's a first time for everything, right? This is grammatically correct, no mistakes, but I'm just making sure that you know the difference between ”nämä” (these) and ”ne” (they). In this entry, you write that ”they” are your first words on Italki, but if these words right here are your first words, you might want to use the word ”nämä” to imply that these are your first words: Nämä ovat ensimmäiset sanani Italkissa. Just a suggestion!