I suggest that you can train your skills on goblins. And you can kill the monsters without effort.
You’ll come to a gate of war, after you answer the questions, you can go through the gate and you’ll that the room is full of goblin, and you try your best to kill them. Then you can look for a guy named Peska, and when you find him, you can trade with him for RS gold. When your mining level is up to 20, you leave the Falador to Al-Kharid, go straight to the north, and you’ll find the mine. Now attack the skeletons and get big bones. You’ll be given 15 prayer XP. Some of them has runescape accounts for sale and will drop bronze helm, helm can be sold in the Grand Exchange at the price of 14-28 gold/ pieces. And if you have started the game for a while, you’ll find that monster’s level is a little lower than you. Most guys spend a lot of time in making the rs gold and level up their account.
If you want to buy runescape accounts and earn a lot of money, you should level up your mining profession to 20.