I did mine last week,i was really dark, base 4 maybe? i bleach bathed it more than once : S then put a 7.31 on it, but i wanted really gold, you could maybe go for a 7.13?, ive dyed mine back dark now,lol! think i had it done for all of 2 days!,
To be honest if i were you, I wouldnt colour your hair atall,I would just put lots of honey blonde extensions in?
Late x