Should I set my stats according to what profession I want to be?
You do not pick a profession (rogue, enchanter, warrior, cleric) until level 15. When you pick a profession, your stats will reset and you can redistribute them all over again. As an initiate, you may want to choose a balanced group of stats... maybe even 100/100/100/100. You will be able to learn all about stats and then make an informed decision on how to distribute them when you reach lvl 15. To learn more about the professions, use the link on the HELP page.
unless things have changed recently your stats do not reset at level 15.