Need encouragement!

Hello my name is Kacee and I just turned 20 years old. I have always been overweight and now it's time to get serious. I was diagnosed with fatty liver disease. I need some encouragement to help me keep going at this and lose some weight. Any recipes or ideas of some light excersizes I can do could be great. I had brain surgery at the age of 16 so I can't do a lot of physical activity. I also have Athsma so I can do some walking but nothing too long or uphill! Please just keep encouraging me to keep at it! Thanks
-Your Friend Kacee