Thinking about a fish finder...…I have zero experience and know absolutely nothing about them. I have a drift boat that I have used in the rivers for trout and salmon fishing. no need for a fish finder there! Lately, I been putting the outboards on the boat and heading out to local lakes and such. Blind. Never fished these lakes before Getting skunked mostly even when I am doing the old night crawler harness dead slow for walleye that works so good where I used to live. What should I look for, what models are available, is used a way to go? Million questions, actually don't know enough to know what questions to ask. Teach me.