The first thing is not to back off by going to the mall to buy clothes or sneakers. First, go to the right place, look for a doctor or nutritionist to find out what type of food you should eat before and after training and medical advice to find out what type of training is best for your biotype and for your purposes and goals, if it's mass gain, if it's weight loss. Avoid going into a supplement store and going out and buying several supplements, whoever is at the counter is sometimes not the person trained to indicate what is best for you.