There are hundreds of YouTube videos on how to set it up and adjust the settings. It's pretty easy.
And can you tell the difference between fish types? I for one, cannot.
I know what is big on the screen relative to what I'm fishing for. That is about it.
One time last summer it was a tough bite. My wife and I were going for bass and could not find any. As we were going in, I put the unit in the water and looked at a rock ledge. Saw about 7 fish swimming on the rock to sand transition. 6 looked to be deep fish, like stomach to back deep. I told her I thought that those were sheephead. One was a longer more narrow fish, told her it was either a walleye or pike. Made a cast with a jig at the fish, was able to get through the sheepies and it ate. And? It was a pike. 24 inch pike or so. So, if you know how fish look on down imaging or sonar imaging, the thought process is the same.