Google is the best source for your needs
You tend to use both hands when playing a piano also it is a good idea to learn how to read sheet music if you're going to play the piano

if you still need help pm me pictures

Notes that go above the staff are called ledger notes, they follow the exact same pattern as regular notes (CDEFGABC) however they're climbing off the staff meaning that they go higher than the middle C octave.

Here is an example of a piece I wrote -


Notice how a lot of the notes are above the main staff? They're the same notes they're just higher up. The lines going through them are just continuations of the staff to make them easy to place and read. Called ledger lines.

For example, on the first measure you see this -


Lets go ahead and place those notes using what we already know., start with the first chord. We can see the lowest note of the chord is actually on our staff, it's an E note (Remember; FACE for the spaces inbetween the lines) which means that bottom note is next E up from middle C.

Now that being said, start counting the lines up, the first line is going to be F, then the space is going to be G, next line is going to be A, next space a B ,next line a C and so on until you reach the notes above.

Climbing up the keyboard using what we know we can see the notes played there are E, another E and a G played higher up the keyboard.

The higher up the staff it goes, the higher the note is.

Now the note you mentioned " Also there's little circles (o) going through the line" those are just going to be semi-breves it seems like. Semi breves on a ledger line above the staff, so something like this? -


If it's like that then we can follow our simple knowledge to know that it's a semi breve so it's held for 4 beats.

I personally found ledger lines like that really confusing and sometimes still do but after a while you'll get the hang of it.

Generally you will play anything on the bass clef with your left hand and anything on the treble clef with your right hand, both of these clef's can have ledger lines and it can get pretty confusing but eventually you'll get the hang of it.

If you'd like to post the piece you're working on I can help you decypther what notes they are.