Doesn't matter which brand of clicker
I started off using a handful or two of the dogs daily food allowence - so they weren't actually getting extra
I always used to do the clicker training before they got fed also
Have you got the book 'The complete Idiots guide to positive dog training'
It's on the book reccommendations thread and it has loads of stuff in it and also how to 'Charge' the clicker - so instead of getting a book specially designed for just clicker training, this is a good all rounder and very very easy to read and understand
edited to add - Please whatever you do read about 'charging' the clicker before you start using it otherwise you will not be using it correctly and it won't be as effective
Timing is essential