How do I make a cheese, sausage, cracker spread?
Ironically, the kind of sausage you want is called a summer sausage. There are many varieties as the term really just refers to a sausage that doesn't need to be refrigerated. You might be able to find a few different kinds to give you some variety.

As for cheeses, you can sort of go with whatever you'd like. Generally with sausage you'll see stuff like jack, cheddar, havarti or swiss. With crackers you might see a cheeseball which is usually a blend of cream cheese and a cheese like cheddar.