Malejkandy

Hi, my name is Vojta and I really need to get in shape. I'm 15 and I said to myself: "you don't want to be a panda for your 4 years in high school" so I decided to start being healthy. I don't expect to be able to run 5km because of my asthma, but I'd like to at least try. Does somebody have tips for some diet and running with asthma? I'd really appreciate your help.