You can do everything with mouse (or touchscreen). Lets start with these:

  (xterm-mouse-mode 1)
  (global-set-key (kbd "<mouse-5>") 'scroll-up-command)
  (global-set-key (kbd "<mouse-4>") 'scroll-down-command) 
  (global-set-key (kbd "<wheel-up>") 'scroll-up-command)
  (global-set-key (kbd "<wheel-down>") 'scroll-down-command)