You can use Max's standard materials fine if you're just previewing stuff, plug it into the bump slot at 100 opacity as "normal bump" and then a bitmap inside the normal bump, then tick this in the viewport:
I agree, a good start! I think the bump is too strong. Try modeling in the cracks rather than using bump to make them. Bump is great, but should only be used as an accent to things.
Hey Linkitch! For now, at least, NDO is the primary normal map development tool. You'll want to make almost all of your details in it before you move on to DDO. In DDO, you can add a bump map channel to your project (in the top right of the primary DDO window, click the dropdown menu, Add New Map > Bump) and the bump map…