I think you only have some idea about GST but not the details.
If you are really serious about the issue, then you have to get in touch with a lawyer in your area and discuss things. Only by discussing in detail, you will understand whether or not you have to take any registration; what is the benefit of taking registration; what are the minimum requirements to be satisfied before one is required to take compulsory registration; or when one can take voluntary registration; composition scheme etc. etc.
Therefore, instead of expecting a lawyer to come and approach you, better approach a GST knowing lawyer and discuss things with him and then take forward the matter.