Help with understanding keys

Ok so i play guitar and am new to the harmonica i have a backing track which basically goes from E to A the chords are just 5ths the overall key of the song is E Minor i have a G harp so all the notes should fit (Theory suggests) as its the relative major can anyone gives me some licks to play that will be more E minor based than G major.

It’s called 3rd position. Your EM chord are notes 4 draw to 10 draw. Play those.