How can i GAIN weight and muscle?

hahah i had the same exact problem. I was 100 pounds for like 2 years. This is what you HAVE to do. Eat alot of cookies like before bed and ****.. dont eat greasy junk food bc u dont wanna die.. But eat like cookies and ****.. When u eat alot of food right before bed it turns straight into fat. Then the next day you work out. REALLY HARD. Not runnign but weight liftin. You have to make sure you eat alot before bed and work out alot. If you work out alot you will gain 13 pounds easy.. What most people dont know is muscle weighs more than fat