D.,
You do not need to take a baby signs class with her. The best way to teach her is while you're at home talking to her and showing her the signs at the same time. I have a set of 3 books that can help you with a parent guide and quick reference sheet included. It's from Discovery Toys and I have one if you are interested. Cherck it out my website at cindystoybox.com. As for the separation anxiety, it will be easier for her if you start daycare now rather wait until she's a year old according to the experts.
Good luck!
C.