50g sounds too much for clicker training. Can't quite picture in my head exactly how much that is in reality. But 1 jumbo prawn should be able to last a couple of sessions plus jackpot reward. You want teeny, tiny pieces. The first couple of sessions should just be "loading the clicker" - click, treat, click, treat, click, treat, click, treat etc. Then next a split second wait between click and treat and thats when you should see the association between click - treat.
Hope that helps.