I need ballet tips!!!!?

So, I haven't taken ballet in about three years and want to start again in the Autumn. I really need to get my flexibility and strength back. I also need to prepare for pointe because I had an evaluation about two weeks ago and the teacher said I needed more strenth in my ankles than I would be ready. Does any one have sugestions for stretches, strength excerscises and other ballet related things. (Stretches can inclube a ballet barre, I have one)