Ditto, on the knife selection. Any long sharp knife will work - especially a carving knife or a bread knife. An electric knife may or may not be the ideal choice ... depending on where you're carving the hunk-o-beast and if you will be tripping over extension cords to use it at the table ....
are nice - especially if your going to carve at the table and don't want the juices running off the cutting board onto the table. They generally come in 3 different configurations: (1) a groove (trough) around the outer edge, (2) groove around the outer edge with a large deeper well at one end, (3) groove, well, and a "tree" in the middle to channel juices to the well. Here is an example
of the latter which shows the trough around the edge, the well, and the tree (something like this is what I would prefer for carving at the table). But, it's certainly not mandatory - especially if you're going to carve in the kitchen.