In reply to tommyzero:
I was in a similar position to you about a year ago. Trying to get back into climbing after 10 years of fewer and fewer trips.
I found that although I was plenty strong enough, it took a fair few trips to get my head back into it.
Therefore, my advice to you would be: not to worry about getting any stronger or fitter, because that probably won't be your main limiting factor. Instead go and have a good time doing routes well within your grade, you will have much more fun and will be less likely to injure yourself through training or have an epic!