Yes I'd start with your night basal rate first, reason being if you get that right it means you have a good third of your day sorted, plus if you wake with in-range bg levels it sets you up for the day and leaves you feeling positive.
Just one other thing, there's a excellent book you should purchase (if you don't own one already) called Pumping Insulin, it's a must read for those who are new to pumping insulin or for those who are thinking of changing over. Let us know how you get on.