open files on startup

[JT Fleming]

I am trying to open 2 files and the programmable calculator on
startup.
I can open 1 file but can't figure out how to get the other and the
calculator.
Any help would be appreciated.
Here is what is currently used to open a file
(custom-set-variables
  ;; custom-set-variables was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
 '(initial-buffer-choice "~/diary"))