well, going with what meili said in a different thread, fight stuff lower than your combat level because you get exp per kill, not per damage like on rs2, so it's faster to kill weaker things if you just want faster exp. personally i've been hanging out at dark wizards south of varrock for a while, got 7 defence levels and 2 str levels there last time i logged in, as well as like 10 mage levels with only runes i got off drops and a few prayer levels from the bone drops.. so that is definately a good place to go. depends really what kind of food you have and such as well, personally i have salmon i fished myself as food, but i only carry like 5 on me at a time and i've not run out yet, i'm also like 31 cmb now though. do you mind if i add you on rs? we'll hang out on rsc and kill stuff sometime. as for your actual question, i was killing men at like level 5, barbarians at like level 14, skeletons at like level 18 or 19, then zombies at like level 23-24, then guards at like 26-29 or something around there. with my point up above (which was originally meili's point (giving credit where credit is due :D)) i do something with lower levels, if you want runes try the wizard tower or the dark wizards by draynor or south of varrock (beware the level 25 dark wizards, they kicked my [wagon] on my original rsc accounts many times) and then stay there for a while till you get bored with it, then depending on your level if you are around 25 or so, go for the skeletons in the sewers, at about 28-30 go for the zombies, 31-34ish start at the guards or something. broad scale of course, with many possible variances, but it's a totally suitable plan.