Hey Paully,
Welcome back! I don't know that you need to start over from lesson one, but you'll probably find, once your fingers get in shape again, that you'll move along fairly quickly through what you've already done. Have fun with it, find some tunes that you like and go for it. Work on both chords and picking through melodies. It'll come back. Many people take time off, and it's definitely possible to come back to it. And if you can't get in 45 minutes, do 10 or 20. It all helps! Daily practice is probably more important than how long you practice. Good luck! Mary