Not really sure where to start, need help..

The rocker arms are the horizontal pieces that rock back and forth as the engine turns. The pushrods are the long thin round /tubular things coming up from the side deep side compartment in the engine, and push up on one end of the rockers. The other end of the rockers push down on the top tips of the valves. The feeler gauge is slipped between the rocker and the valve tip to measure the gap, or lash. You adjust the nut on the pushrod end to open or close that gap.

Having said all that.....Go on to the Inet and read up on the engine parts. Learn the difference between the intake and exhaust manifold and then you will know which valves are intakes and which are exhaust. (No one here is paid and no one is here to tell you every little thing, just the key things or what anyone feels like spending the time.)

Don't worry about a bit more lube in the cylinders llike MM oil, IMO; if it is light oil, it will seep down past the rings. Since you have drained the oil, you don't want to be putting any more penetrating oil in there; it is not for lubrication.

BTW, sent you a PM. And you're doin' great... keep up the good work!