Lock Screen orientation

hi everybody...being a newbie in the world of iphone i don't know a lot of things about its features and functions. can someone help me to lock Screen orientation on my Apple i-phone ? also i am just blank about swiping gestures, Apps, Folders, etc etc. i mean i don't know how would use swiping gestures, how to create a new folder, how to rename it, and so on....

please help friends i'll appreciate every single try...thanx