Depends on how determined you are and how much time you have. If it's your first time (is it?) and it's just you, I would only do a maximum of three the first time. I personally prefer to get other people to do the actual killing via axe, but I'm a wimp.
If you don't have someone to do the holding for you, use a killing cone. A gallon jug with the bottom cut off, turned upside-down, and nailed to something works just fine. Then there are a couple approaches:
Slit the throat (messy—have a
really sharp knife or you'll probably have to hack and you really do not want to have to do that. A scalpel tends to work well for me. A steak knife can work if you put enough force behind it. Try to avoid areas with feathers, or pull them away while you do it, because knives are mostly not designed to cut through feathers)
Break the bird's neck (I have trouble doing that myself, especially with larger birds like ducks.)
Stick a knife up inside the mouth (easier and I recommend it over either of the other two. Still a bit difficult.)
Cut off the had with pruning shears (more difficult than it may sound sometimes, but effective, if you have sharp shears)
Supposedly, you can also wrap the bird with a towel or sheet, lay it on the block, and immobilise its head between two nails, but with my luck, the bird would just struggle out of the sheet and run away, so I've never personally tried it.
We usually use a stump for a block, then hold the carcass by the feet to let it bleed out. As soon as blood has stopped, drop the body into a five-gallon bucket of 160 F water, push the body down with a stick for thirty seconds and then pull it out and pluck. If you want to skin them, it's easiest to hang them up by the feet and get to it, but you have a plucker.
I have never used a plucker, but the first thing you want to do on getting the birds out of that water is yank out the primary tail and flight feathers. Once that bird has settled a bit, you may have to use pliers to get them out, and I can't imagine a plucker handles those feathers well.
This is a very good resource on how to prepare a plucked bird for the freezer. I'd tell you how I do it, but I mostly learned by watching my father, and I've found that most of the things he taught me about how to butcher animals are wrong. (Do
not put chickens you want to pluck in
boiling water. And especially not for five minutes at a time.)