Questions

So I bought this and this from Hot Topic.
I just have a few questions I was hoping someone could help me with.

1. How bad is this going to kill my hair?
2. I understand that the color fades after 3-6 weeks. So my hair will be a faded red or more of a pink? Will it come out completely? If so will it go back to white from the bleach? Or is it going to turn some sort of skank orange that I dont want to even think about?
3. Anyone ever use these products before? If so what did you think?

Ive been a bottle blonde since I was 14 (and over time have been every other natural looking hair color at least once) but this is my first time going some crazy color so Im a little scared.

Thanks in advance guys