For lower levelled players, consider doing slayer until the point they can kill blue dragons.
For medium level players, consider 85 Dungeoneering for Frost Dragons.
For high level players, the Kalphite King and Nex would provide a bit of end game PvM.
All of these would give a nice amount of experience and gp per kill.
bronze dragons
The best monster to kill in Runescape would be the King Black Dragon.
I would say you should be level 50+. You could be lower but with better food.
It doesn't.
world of warcraft?
green dragons , in wilderness, f2p in dungeenering(i dont know how to spell)
You could kill Deadly Red Spiders, go to the 2nd level in the stronghold of security and kill zombies.
hill giants, bank the bones and you'll make money fast.
He is easy to kill only level 20, you have to be a woman in Runescape to get to him though, my guesses your doing the recruitment Drive Quest.
left click the chicken
Kill Gremlens
train kill stuff