I know I need to give at least two week's notice, and I know I need a letter of resignation, but along with that what should/need to say to my manager?
First show your appreciation and tell him/her how much fun you had and how much you have learnt . Tell him that even though it wasn't something you really wanted but the circumstance requires you to quit tell him/her in with a soft voice and don't sound so exciting that you quit , I don't say act and be fake , but at least know which tone of voice you have to use when you explain why you want to leave . And I wish you the best of Luck in the world Janice :)
"I would just like to let you know that I have accepted another position and you can consider this my two weeks' notice."
Or say "Screw you guys, I'm going home!"
Well u just call and say that u qiut,simple as as can be:)