Play Training for level 11-39 in Runescape
Once you have got level (Runescape Gold) 11. You need to continue your training such as you need to use Cirse with the method like before for the fast option. Because Chas runes are expensive and offer only a small increase in XP over strike spells. So the cheapest option open to you is still using strike spells to kill cows. Unless you are making your own runes even you can use the wind bolt.
Then you need to move onto killing the level (runescape money) 28 hill giant if you are feel confident enough about your character. As you know hill giant have a 100% drop rate of big bones, which can sell for 300gp each. As it is extremely cheap, whilst still being extremely effective, you should use the spell fire strike.
The best place to kill Hill Giants is in the Edgeville Dungeon, as it is close to a bank and contains several safe-spots. As your level increases, you may want to move onto the tougher, level 42 Moss Giants. Like Hill Giants, they have a 100% drop rate of big bones, but also drop other valuable things.
At last you need to continue to method like before with the weaken spell to be your fast option which only for these levels use curse in Runescape.