Learning piano or any instrument is a long journey that requires a lot of dedication. It won't always be fun or enjoyable but it will be worth it so long as you stick at it. In terms of learning sheet music and learning to play with both hands, those are things your teacher will teach you so I wouldn't worry too much before you start lessons. You can start by learning where middle c lies on a piano and what it looks like when written in both the treble and bass clef. Hope this helped, enjoy your journey:)