Let's start with the swing. First, I would like to say that a good place to see the swing done is on the BROOKS KUBIK video. To start, you need a good dumbbell. You are going to try to get the form first so start light. Now stand over the dumbbell with the bell between your legs and your feet spread a little wider than shoulder's width. Reach down and grab the bell with one hand bending your knees. (Don't worry about which hand to start with, you will train them both.) Keep your hand right up next to the front plates. Now, keeping your arm straight, take the bell up to your waist and let it swing back between your legs to get some movement. Then swing it up over your head keeping your arm straight the whole time. Putting your other hand out to your side can help you keep your balance. Repeat these steps with your other hand. I don't recommend doing reps because your form starts to suffer. It is very important to always keep good form even if it means using lighter weights.
The one arm clean and press is actually two one arm movements in one, the clean and the press. You can train them together or separate. I sometimes separate them depending on how I feel or if I'm training for a certain contest. This movement starts similarly to the swing except you don't swing the weight. Instead you clean the weight to the shoulder, get your balance, and then press it overhead. Now a little warning, it sounds easier than it is. The form has to be good on both the clean and the press. In the press, you should lay back a little because it helps keep the bell stable. I'm not a big rep guy with this one either but you can do more than the swing. I would say do no more than five reps and keep tight. If you just press, have someone hand you the weight and keep tight all the way up and down.
The one hand snatch is next. I personally am no good at this one and to work at it to feel comfortable with the weight I am using. I find that this is a great movement to make you stronger but it is a bear and I would not say it is for everyone. It is really hard if you are tall or have long arms. It is almost like a regular snatch, but again, you start over like the other two movements, the swing and the clean. The balance you need to get heavy weights s great so start light and be careful. Make sure you get under the weight and control it.
The last movement is the bent press. I tried this movement about one year ago and found it not only awesome for body power, but it trains the core of your body like crazy. This will help you build a stable, strong middle and help get some flexibility. Now, I do this with a dumbbell from he floor and start the same as the other movements. I know that some people start the bent press differently and that is cool, but I like to keep everything in the center of my core to always keep control. Now once you get it to your shoulder, start to press and as you start to press, start to bend away from the bell. As it goes up at the end, you should be bent at the waist with the bell over you. This movement is going to help your core and you will get sore. This is a movement that can be done for reps but keep the form tight and focus on each rep.
Now, one arm movements are great, and on their own could be a session. I'd like to add them to my training. I feel that they are great for building a good stable core and they will work you very hard. Sets are up to you. I like to keep them in the context of my training at the time. I have done twenty sets of singles on the swing trying to find a top weight. I find they help now that I have started back into martial arts because I grapple and working on balance is important. Try one arm training in your program. Good luck, train hard.