Well that's okay! This is a fun place to start. If you know some scales already, then you must know how to read notes on a grand staff, correct?

Okay, if you don't, then that is where you start. Pull up a sheet of paper, draw a grand staff, and write both the treble and bass clefs, and arrange A-G on both, in order. Then write them backwards. Next you write all the scales you know without looking them up. If you don't remember how any of A-G on a treble bar looks, you need to practice that. Bass clef is different-and notoriously harder for musicians-and you also need to get that down.

If you can write both T&B notes in ascending and descending order without cheating, you are off to a good start. If you can write the scales you know up and down without cheating, that is a great start. And you've already alerted your first problem.

You don't know all of your scales. Start with all major scales then all minor scales. Write them on the staff, ascending and descending. This of course, is after you are able to identify all the notes on a grand staff without cheating. These are the building blocks that you have to nail without a hitch. Major and minor scales will come easily afterwards, and then you can learn all other scales you are curious of...

AND THEN, before anything, you have to know what the hell a grand staff is with at least rest stops, and time signatures. Start on 4/4 because 4/4 is the most common beginner's time, then 3/4--but that is jumping slightly ahead, because you still need to learn all your major and minor scales before processing time signatures.