For a proper treatment plan one has to see your tooth clinicaly ,with help of X-rays  we will come to know about the prognosis of your teeth i.e. extraction or root canal.you said there is no upper layer so we may have to raise your bite.

Obviously everyone will say he or she is the best. Depending on your requirements and budget, opt for good treatment.. Expensive treatment doesn't mean good treatment..

The criteria of a "good doctor" varies from patient to patient so we cannot tell which doctor is "good". The right specialist with a good enough experience will be able to help you in a better way. Search for an endodontist or a prosthodontist in your vicinity using Practo and look for the reviews and the experience and other details. Regards.