Depending on your screen resolution, the default size of the Emacs window may be agonizingly small.  Instead of manually adjusting the size each time, you can configure Emacs to open to a different width and height by default.  To do so, add the following to your .emacs file (typically located in your home directory):

;; Set Frame width/height
(defun arrange-frame (w h x y)
  "Set the width, height, and x/y position of the current frame"
  (let ((frame (selected-frame)))
    (delete-other-windows)
    (set-frame-position frame x y)
    (set-frame-size frame w h)))
 
 
(arrange-frame 105 60 5 5)

The arrange-frame function call at the end is what you should modify based on personal preference.  The first two numbers represent the window size, the following two represent location.  The configuration above creates a page-sized window in the upper left hand corner.  There will be a slight delay from the time when emacs draws the intial frame to when it resizes the window, but it is mostly negligible.