most places should have the caps they are usually in the "help" section. if you are going to keep the coolant rail on the lower intake you'll have to loop it with a hose at the back of the rail. So obviously if you don't have a good hose to use you've kinda defeated the point of not buying the right ones.
If you delete the coolant rail you use a cap to block off the one fitting from your water pump to the rail and two caps on the heater core to keep crap out of it. And yes you would need hose clamps. You'll need a reducer bushing for the coolant sensor though once you pull the rail. Can't remember sizes right now, you might have to do a search