firstly what type of sluicing you plan on doing? do you want just a nice small river sluice that you can sit and just hand feed or do you plan to turn bigger amounts of material using a highbanker with a petrol pump?
a sluice can be bought or you could make one if you are handy on the tools, they dont need to be fancy by any means and the set up can vary a bit depending on the gold you are chasing, have a look through the forum there a many talks on sluices and i am sure you will find one you like, most of it comes down to trial and error but you will learn a lot from here and it lowers the error, i started with a home made river sluice now have a highbanker with petrol pump also