The most rewarding tasks to finish using OSRS GP Dwarf Multicannon assistance is Suqahs, Kalphites, Dagannoths and Black Demons. In addition, once you reach 90 in Ranged you can start bossing which is a great way for building a bank. In killing bosses, you will not have to be getting leveled Ranged at the same speed as other strategies but you'll benefit hugely.
At first, you will want to tackle anything that happens to you. The best place to begin with is Frogs in the southern part of Lumbridge castle. Goblins on the east , or Cow farm a bit further to the north-east. If you're just beginning to learn about the game and are in need of cash to buy your first Ranged equipment, pick the hides of cows and deposit the hides to sell them on the Grand Exchange for a little amount of money.
You can access them by a journey to Zeah. This can be done through a phone call to Veos who is in Port Sarim. Once you have that, simply run across the beach in the direction of south until you see Sand Crabs. The process of leveling them is easy due to their weak defense stats and their high health pool. Be sure to have the best available armour to your level and have an inventory full of food in case they hit from time to time.
After completing Bone Voyage quest you can move to Fossil Island to fight Ammonite Crabs. These are more powerful rs3 gold than their Sand cousins since they have an added 40HP. This means you'll be able to slow down a bit while fighting them than with previous creatures. If you do not meet the specifications in Bone Voyage or just don't wish to, you can kill Sand, Rock or Moss Crabs for as long as you'd like to. They'll provide good numbers of experience for all levels.