to make it REALLY simple,,,you CLICK and treat,,,ask for a behavior CLICK/TREAT,,,OR,,if your like me, and sometimes do what we call, free shaping,,,the dog does "something" you want without asking, CLICK/TREAT..
Clicker and Treats should be in the same hand,,
It does take a little getting used to, but don't give up,,it's a wonderful tool and you'll be surprised how fast your dogs catch on..
OH,,to get your dog "started" I always do, what I call ,,"boot them up" (for dogs that have never been exposed to clicker)
Have your dog in front of you,,,and just "click/treat, click treat, click treat" ask for "nothing",,,it gets the to associate the CLICK with a Treat...
I'm sure others will chime in with more in depth advice