Before you hastily jump into an agreement with any singing coach you need to be certain that they can deliver what you need. You should have a very good notion of where you want to see improvement, your present skills and your perceived end product, whether it is one song or general attributes. Building a strong relationship with your singing coach will create a bond which could lead to friendship, connections and a fun experience. You want to be sure that the coaching will not be hours of boring and repetitive lessons but will engage you in a positive way.
It is highly recommended that you propose a one session consultation or sample lesson where you can tell whether the time has been constructive and useful for your needs. Remember that what you want and what the singing coach envisages may be 2 completely different things so you will need to speak to them to find a healthy balance to what the both of you foresee. This does not mean that you have to surrender your dreams but reality can sometimes hit hard so be prepared to accept useful criticism, when needed.>