A very nice set of pens there Sharpy, the only one I'm not sure about is the second one down which seems to have a concave top but its still a nice pen. When starting out you will use what is to hand, the first finish you've bought and as you progress you will develop your own style of finishing and product to use. I started with wax of a variety of types and eventually went to ca but only use this if you can assure yourself that the fumes are not being breathed in. There are a variety of methods also of using ca...
I am still always trying to find a better/new way to finish my pens and I guess I always will be. You'll be amazed at how quickly you'll develop a finish that you're reasonably happy with, the ones you've show are good.
With regards to sticking the tubes in there are also a variety of methods such as epoxy or ca. I use a medium ca and have a good success rate with it and can glue the tube in and start turning within minutes. Other methods need preparation time and as an impatient person it doesn't suit me.
