need help

Yes, you need to know a lot about how dye works to get good results yourself.  If you want to go blonde, you will need blonde dye with a green or blue base to counter the orange that comes out.  Its easier to get a pro to do it if you can than learning all about how hair dye works. 

I'm not a pro, but I can tell you how to do this, as I've done it plenty of times before.  If you do want to do it yourself, don't go for boxed colors at the drugstore, you don't know what base is in those.  Get your dye and developer at Sally or another beauty supply shop (its cheaper that way anyway).  The base will be written on the dye, you need a blonde with green or blue as the base.  Do not get violet, or neutral, they will only make your hair more orange.  The developer you choose will depend on how light you want your hair.  40 is very strong peroxide, 20 is weaker, you probably don't want to go less than 20 since you want to go blonde.  Don't forget to test strand everything to avoid making big mistakes.  If you really do want to learn to do it, I'd suggest reading Claude's sticky at the top of the hair color forum here, it has much basic info.