ME and TVA

Hi All. I have been AE/ME since 2014. I have never reached the limit for TVA, €34,000 I believe, but will do shortly I suspect. Can anyone guide me through the process of registering and the easiest, (if there is one) method of administering it please? I have now one major client, but also do a small amount of work for other clients and hope that this will suffice for URSSAF. I do not know for example whether the TVA is charged on fees after I reach the cut off, or from €1. Do I need an accountant at this stage? Many thanks. Roly