The Rogues Den located underground in Brimhaven, to acess this pay to play area, you must enter the inn and open the trapdoor, then proceed down the trapdoor, go west and you will see a fire, there is also a baner right next to the fire.
Assuming that you can acess the cooking guild, this is the best place to raise your cooking level, there is a bank with a stove next to it, stoves are better than fires because they have a lower burn rate.
The best free to play cookig zone is Al-Kharid using the range.
Catherby. There's a fishing hole, a bank, and a range all right by each other.
