My advice is to choose a hook size that suits the bait you’re using.
Line: I recommend at least a 10lb line. Some people fish for carp using heavier lines – up to 20lb.
Fact is European Carp can be heavy. They can be a bit like dragging in a thrashing log.
They are called “Mud Marlin” by some Australian fishos for a reason!
Choose a rod to suit the environment you are fishing in. Keeping in mind the weight of some carp. 6 to 9 feet is a good rule of thumb.
Most rivers and lakes won’t require you to cast very far to reach the fish.
A shorter rod can be a huge benefit when it comes to overhanging branches and tight squeezes.
A landing net can be useful.
Just make sure it’s strong enough to hold the fish.
You don’t want to break the net!
This video shows you how easy it is for a net to break when dealing with these deadweights.