It's people like you that make trolling so very enjoyable. Thanks for the laugh, mate. You make a good point about overpopulation not being a issue though, thanks.
It depends on which godsword you plan to buy. For example, a SGS is quite the useful weapon for slayer because of it's special attack. I would recommend that you get a SGS (you could just settle for an enhanced Excalibur) and a whip; the whip for the main weapon, the SGS for the special attack.
You mean 83 slayer. They are a terrible source of exp, money, no effigies, etc. Opps, my bad. xD My friends kill them for money and get a good deal off dragon boot drops. Maybe they're just over exaggerating it. :/
I played pest control a lot when I first got my membership, after awhile I settled down and quested a bit. I recommend you go and play some of the many p2p minigames. :)