Singing and stuff like that?

Drink plenty of tea with honey, water, warm up before singing, and rest your voice as much as possible. (Don't talk. Whispering is worse than talking, by the way.) If you're only going to be doing this for awhile, it should be alright, and I doubt you'll suffer permanent damage, but if you are going to be screaming for years... expect for your vocal cords to be messed. ;/ Sorry, that's just how it is.