Yes, there's a bomb trolley and bombs,and yes Bill, there are about three sets of PE details for this kit, covering internal and external, I think from 'Flightpath'. I cut the bomb bay doors on mine, and I'm still part way through scratch-building the framework for them - 14 years on!
The PE sets are expensive, so you have to decide if it's worth it, as not that much can be seen of the inside, even if you stagger the waist windows as I did, to model a later version.
With the entrance hatches cut open, a little can be seen in these areas, but the most visible is the bombardier's nose compartment, and a small amount through the radio room upper hatch. The inside of the bomb bay can only be seen via a mirror, or by turning the model upside down!
As Wayne said, take it slow and easy, and it will be a beautiful model - bl**dy big, but beautiful!!