How do I know the vowel?

I’ve been trying to learn Arabic and just signed up for TalkinArabic. I used DuoLingo for quite a few months. But since I want to speak/ understand Saudi Arabic, decided to sign up for TalkinArabic. As I’m going through the beginner .pdf’s (animals, vegetables, etc.), how do I know what vowel sound is used with the consonant? The .pdf doesn’t list the little symbols above below the letter like I saw in MSA on DuoLingo. Does Saudi not use them? Please advise. Thanks!