Goldwell Color Chart Goldwell Color Application Help Please..?

Goldwell Color application help please..? - goldwell color chart

Goldwell Application Help please .. Color?
I am not very familiar with Goldwell .. I have a level of 5N .. Hair and want to gain a little red in the same sound level is only 5RV mayb .. .. (not too dramatic)

1. Do I have to leave empty-handed?
2. I have virgin hair .. I turn it in the middle of the chain to stop, then the roots of coverage at work or even if it all at once?