This probably isn't what you want to hear, but the best thing you could do is pick a Beatles track that has the tone you're looking for, and play along with it. The AC30 model is a good place to start, but don't limit yourself just to that. Another model might actually get you closer. You mainly just need to play around with your effects unit to get to know how different settings sound. That is the best way to learn how to get the sound you want... try different things until you find what works. Another thing to keep in mind is that what works for one person more than likely won't work for everybody. Good luck in your search for tone, it's a fun quest ;)

BTW, Welcome to GT!