Where is 'Saturday Night Live' set?

Where is 'Welcome Back, Kotter' set? Who created 'Welcome Back, Kotter'? On which network did 'Saturday Night Live' originally air? In what year did 'Saturday Night Live' premiere? In what year did 'Wheel of Fortune' premiere? Who created 'Wheel of Fortune'? On which network did 'Laverne & Shirley' originally air? In what year did 'Laverne & Shirley' premiere?