Yeah early morning shift will be tough at first ...
Talking to the elderly is so much easier than you could imagine... They just want to be heard and spoken to like an adult, So many people talk down to the elderly

..Just because someone gets old doesn't mean they get stupid .
I miss working in the nursing home/ALF setting .. Some of the greatest people I have had the honor to know were patients I took care of. Many were rich ,many were just dumped there by "family" members.. They all have a story to tell about there lives. They just want kindness and respect. It's really easy .. I promise.
As for putting your 2 weeks notice in .. Do it in writing and if asked why you are leaving .. respond with "Although I have enjoyed working here I have found a position that is a better fit for me"
You are going to do fine