Quest profile. straight up.
I did something very similar in the profile below
farm 2500 leather
hearth, use scrolls / AP items
Sell + Mail
repeat.
Now, you said : 'cast a specific spell ID'. Looking at what your doing im going to assume you are thinking crafting profession skill? In which case you are attempting to call a protected function. Blizz has put a lot of effort to make the craft button's 'bot proof' in legion. you will prob end up just mailing raw mats to a bank and mailing them back when you are ready to craft.
Best of luck
