Anyone help me with the modes, im having a hard time understanding how to use them?

What if the chord progression goes..... Am----C

What are my options for soloing???

you could look for scales that have the chords C major and A minor, C major scale or G major scale are examples or their relative minors which are A minor and E minor.
So you could use any of these scales or the pentatonic scales of any of the above to solo with.
I'd have to agree, A minor lead goes great over C major rhythm especially acoustic