• No one here will be able to tell you what size your tempdb should be, if you have an ample amount of space on your drive or even better a dedicated drive \ mount point just set tempdb to a certain size (split across the number of data files you have chosen) and don't look back.

    If you are restricted then start off with 4 1GB files + the log file, if you experience aggressive growth then you can change the size accordingly.