Probably be able to get tiger worms from anywhere that sells wormery’s.
First of all i would put some chuncky rocks in the bottom of it and then put some really fine wire mesh over them, then the tap wont block up with slime and dirt. I half fill mine with compost and then just chuck everything from table waste to tea bags in it. Mine is on a fairly big scale and probably have around 5 – 10 kilo in it at any 1 time. You really want the wormery in a fairly warm place. Mines in an extension of mine but a shed will do or a green house. If you can keep them warm enough they will still breed and eat quickly. Just chuck most of the food waste in it during this time of year.
Nathan
http://nate-fish4thought.blogspot.com/