There is no rule for who is the right mentor. You should firstly understand and get to know each other. The following filter can help you a lot, which you can (but don't have to!) use. How do you feel? If you don't know what to do, put the future of your business in the hands of experts who will connect you to the right mentor.
Choose a mentor based on their line of business. The fields listed are according to the European Commission's CZ-NACE classification
Choose a mentor according to the language in which you want to communicate with him.