It's hard to pick a starting point on where to begin in explaining our disdain for gender-reveal parties, but the name itself seems like a good one, in the fact that it's a complete misnomer. You are not revealing the gender of your baby; you are revealing the sex.
DNA Polymerase is a polymerase that synthesizes a DNA strand ... so it's used in DNA replication. RNA Polymerase is not used to form the primer-that is primases job. RNA Pol is used during transcription to synthesize the mRNA strand. EK does a decent job describing a primer.
RNA is synthesized by RNA polymerase that reads one strand of DNA. RNA polymerase reads DNA 3' to 5'. When RNA is made, it is made 5' to 3'. Most polymerases have the 3' to 5' reading activity. The created RNA strand is identical to the coding strand of DNA, which is also in the orientation of 5' to 3'.