Unless you're learning taiwanese or something you shouldn't get too confused. A good starting point is of course to learn
all the hiragana and preferably katakana. I assume the book uses Romaji to teach you right?
If so, you could probably practise the hiragana by writing the appropriate ones above the Romaji. (That's just one way to do it of course)
And like always, you can ask lots of questions, not just me but anybody on this forum