It depends on what your goal is. If you want to become a professional, you should lose weight. Since you said you want to lose weight, you don't have to. You can search for tutorials online and explore for yourself. If you have poor self-control and need supervision, or like some people, you have no motivation to exercise without spending money, then it is unnecessary to spend some money to find a coach. Otherwise, one is to make you progress faster and let you find the feeling of spending money for gains, otherwise you always feel that you don't need to work too hard without paying too much.