Funny that legendsport posted that just as I was thinking about replying.
Myself, I focus mainly on ZR (which is a misnomer, really should be UZR). It's an approximation of the number of runs prevented (postive) or lost (negative) when compared with a league average fielder at that position. For the most part, I focus on keeping that number positive.
If you want to quickly improve your pitching, one of the best things is to improve your defense.
I think Victor Rodding's mom might consider him a second baseman, but I'm not sure if anyone else should. Luckily he hits well enough to (mostly) cover up those faults.