Astronoob

I've just recently started playing KSP. Great game. I have just discovered this site and the fact that mods exist for it. I'm also new, and have no idea how to do these things. I have an interest in MechJeb. I see I need a "toolbar" mod. I also see references to a stock toolbar. I do not seem to have any sort of toolbar on my screens...do I need to somehow make one appear, or do I need to download a toolbar mod? Please don't hate me.