2 quick questions: 1st after using arcane initiate's ability and drawing 3 cards the only spell drawn is Dark Memory do i have to draw it? or can i pass?

2nd Dr. Armitrage is on the table and i draw whatever weakness i have in my deck can i choose to discard it and gain 3 resources?

1. You have to draw it. Once you've initiated the ability you have to complete it unless it says "may". (pg 3, top right)

2. No. You cannot voluntarily discard weaknesses. (pg 21)