This minute, start studying for your GRE & CCRN. Get your ACLS, PALS, TNCC now if you can. If you haven't looked, target 4-5 schools that you want to apply to and see what prereqs they offer. Enroll and take 1 class at a time. By the time you hit 1 year, or a little less, you can start throwing out applications. If you get rejected, you have everything (and time to retake entrance exams!) you need to be a strong applicant the next season.
I got everything I needed done in 7 months, applied with 1 year of ICU experience. ? You got this!