I bought an Anuka smoker a year or two ago and it is an impressive device for smoking fish and anything else...cheese, sausages, whatever. It's powered by mains electricity, so there's no hassle with fuel and it comes with instructions, recipes etc. I thoroughly recommend it. Click here for more information.
The type of smoking used for kippers and smoked salmon etc. is cold smoking where the fish is not cooked but just preserved by cold smoke often a day or more in the smoke and hence tends to be more tricky to do at home but people do make them out of old fridges and piping etc. Obviously there's a certain economy of scale here and it helps if you're doing a lot.