What is the absolute fastest way to level up all the combat skills as a free to play beginner with no friends, no guild, no connections, no card swiping?

Is it just do security dungeon for 10k -> Kill chickens -> Upgrade gear every 10 levels -> Kill cows -> Kill the grasshopper things in stronghold of security?

Right now killed chickens for feathers to level fishing for healing items, killing over 500 cows to level crafting via leather, then that might put me at 20 combat / 20 strength / 20 hp / 20 defense. Also killing random imps for the beads for that wizard quest. 7 red beads, 1 black bead. Bad luck.