Well it depends on your tactic, there are some people that pvp with lasers, some with kinetic weapons, rail guns and whatnot, all depends on how good you are with said weapons, I would recommend you get the weapons you feel you are best at using, though I would recommend learning fixed weapons or training hitting ships with untargetted gimballed weapons, chaff and shield boosters are generally needed.
It really really depends on a lot, on target and such. It is going to sound odd, but I actually recommend you practice against the enormous amount of pirates in imperial clipper, depending on your ship naturally, because imperial clipper is the ship you might face most often (though that may change in 1.4), and imperial clipper is a good ship, you might consider that for initial pvp, there's a reason so many fly it, its in my eyes too great a ship for its price. Has very little in terms of flaws and can almost always get away.