About four months ago I bleached my hair and now I have really ugly dark roots. If I dye a redish color over my blonde and dark roots will they turn out two different colors? I don't have money to get a professional to do it so I really need to know if its possible to make then the same color and how to do that.

Yes, it will turn out two different colours, possibly three There is no way you can accomplish this on your own without a disaster, and quite beyond anyone except a professional.