As mentioned before experience rates are quite low with 10-20k per hour. However, the gold you can extract from these runes makes it worth it. It is possible to OSRS Gold make around 2500 runes per hour at 59 RuneCrafting which will approximately 350k gold.
Cosmic Altar is located in Zanaris in Zanaris, which can be unlocked with Lost City quest completion . There's an Agility shortcuts at the levels 44 and 65 that can make your journeys more convenient, but if you don't have any levels yet, you can still use Fairy Rings to get around the area in reasonable time.
This is an identical technique used to create Cosmic Runes. If you've completed Lunar Diplomacy quest you can begin creating Astral Runes at Altar south-east of the village on Lunar Isle. Begin by taking Runecrafting pouches, Earth staff, Law runes and essences. While running to Altar be aware of 111 Combat level Suqahs which can hit you quite hard if you do not pray for melee. Once you've finished crafting runes , make use of the Moonclan Teleport to get to the bank to store the work you've made. This technique will yield approximately 800k gold and 30k exp every hour following the level of 82, when you are able to create double Astral Runes.
Another successful method for creating runes is to use Abyss. If you have completed on the level one Enter The Abyss miniquest you can now use it and craft Nature Runes and if not you'll have to go through this to be able to use this method. Begin by equipping amulet of beauty, and then take the Rune packs and essences.
Go to the wilderness just north of Edgeville to find Mage of Zamorak when you talk to the Dark Mage you can teleport to Abyss. Inside you'll begin in skulls, and if you do die you'll lose everything. Utilize one of the tunnels to get from the outer ring to Buy RS Gold the inside ring. It is necessary to clear obstacles like mining rocks (which will require a mining level) or cutting down trees that block your path, so take with you a cheap pickaxe or axe.