First of all, congratulations! I'm sure you walked out of there not knowing whether you passed or failed. We've been there.
Next steps include submitting a copy of your NREMT certificate, CPR card, and (in IL) a completed personal history statement (found here) to the EMS coordinator associated with your EMT Training program. Depending on how fast your coordinator and department of public health moves, you may receive your state license in a few weeks to possibly a month.
Please reach out to your EMT Training program with specific questions!