1st time bleacher..eek

Ok so I have never bleached my hair (unless they did so at the salon when I got highlights but I'm not sure what they used).  I started out first getting highlights at the salon and about 4 years ago and then I switched to coloring at home with an all over color, usually Ion Brilliance in Hi Lift Ash Blonde. I always have a problem with my roots, they tend to come out orangey and I've tried toners and shimmer lights shampoo.  I really want to be a white blonde and although I am very close to it now, it's not exactly what I want.  I'm thinking about bleaching.  My hair is in okay condition, not as soft as it used to be, but not coarse either. 
If I were to bleach what would the steps be?  would I just bleach over my colors?  Any good bleach anyone could reccomend?
Sorry for all the questions just really nervous. :)

I have bleached my entire head before with great success. It can seem daunting at first because a lot of people seem to have "word phobia" about bleach, but as long as fully know the steps, the level system, and have the tools you need it can be done - and look good. Bleach is fabulous, I love using it.

Depending on the level you are now, you may, however be able to achieve platinum blonde with a high lift dye and 40 vol developer. Judging from you saying your hair has orange in it, I'm assuming you will need bleach.

If you already have colour in your hair now (the high lift blonde) applying another dye on top will do nothing. Colour does not lift colour.

You will need bleach. You can go to a salon and ask for this, and watch their techniques etc, or you research it online (thoroughly).

You will need to learn the universal level system first and foremost. And go from there.

Let is know what you decide.