Identifying keys

[chilly20]

Okay. Here goes nothing:

C, G, D, A, E, B, F# and C#= 0, 1, 2, 3, 4, 5, 6 and 7 sharps respectively.
C, F, Bb, Eb, Ab, Db, Gb and Cb= 0, 1, 2, 3, 4, 5, 6, and 7 flats respectively.

That's the major keys. Minor keys are a third lower.

A, E, B, F#, C#, G#, D# and A#= 0, 1, 2, 3, 4, 5, 6 and 7 sharps respectively.
A, D, G, C, F, Bb, Eb and Ab= 0, 1, 2, 3, 4, 5, 6 and 7 flats respectively.

Minor keys can have the same key signature as major keys (like A minor and C major). However, the minor keys tend to have more accidentals (added flats or sharps) in the piece, cause of the raised 7th note.

I really hope this helps.