After reading and getting a couple of responses about planes I purchased the Woodriver #4 from Woodcraft. I certainly am a novice and know almost nothing about planes. With that said this was fun to use. I lapped the bottom and it was already flat. I sharpened the blade just a tad (it needs more) and I planed the rails and part of the surface of my workbench to flatten it out. It worked really well and in about 45 minutes I had all the rails, vise jaws etc flat.
Here is my question: Underneath the adjusting knob there are 3 screws. A larger one in the middle and two smaller ones on either side. What are they for? There were no instructions, directions at all with the plane and I didn't want to mess with something and screw it up.