This is very difficult to do yourself, and i definetly dont suggest or recommend you doing this yourself.
however, i dont want anybody to walk around with messed up hair, so i will give you any help i can.
hoping it lifts evenly (and doesn't get some light spots and some dark spots), if its a real orange orange color, you need an ash toner. if its yellow orange, mix ash and platinum. if its yellow, just use platinum. depending on exactly how orange or yellow it is will determine if you need to mix in a natural or neutral toner as well. i can't tell you this because i dont know your hair, i dont know what you've done to it in the passed, if anything, and i dont know what color it will turn.
you should REALLY go to a professional for something like this.
i can't say how much it will cost. all salons are different, and charge different prices. it also depends on your area...if your in the city, it'll also be more expensive. at my salon, i charge anywhere between $80 and $150 for a full head of bleach and toner (its called a double process color), and that does include a haircut (you'll probably need it afterwards). i would call some GOOD salons around your area and get quoted, but they'll probably also give you a range of prices. you never know how much work its going to be, so you cant give an exact number.
you're hair will come out MUCH better at a salon. if you end up doing it yourself, you'll probably have to go to a salon anyway to get it fixed.