Once you've built one of these two you have the option to create a second room below the first, and there should only be OSRS Gold one choice for this. After you build those room(s) it is possible to build in the normal way in construction mode, constructing treasure rooms, dungeon passageways and junctions. You can also build any other room from above that you wish to create down below.
If you've never already, doing your Love Story quest unlocks a unique dungeon-like room that adds a variety of new guards for dungeons that you can add down there for example, scarabites black demons, iron dragons and so on. Also, most of them are cheaper than the original monsters like hellhounds, trolls or dragons etc.. If I missed anything please feel free to ask and I'll be sure to answer it again.
Lardar pretty much summarised the best methods, but to make a proper plan , we'll need to know the exact level at which you're.
The best way to begin will be to begin questing, just like the majority of skills. Simple missions like The Restless Ghost, Priest in Peril, Holy Grail, and Recruitment Drive will be there to guide you through the basic of Prayer skills. After that you'll have to be able to harvest bones in order to attain higher degrees of Praying.
A reliable source of Prayer income from experience lies in Dragon Killing. The bones of Dragon Killers provide significant experience and do not require the highest level of skill. To kill Blue Dragons below the Taverley (in Taverley Dungeon) you do not require a lot of resources to Cheap Old School RuneScape Gold do so since they can be killed in a safe area. If you're looking to accomplish this, you should remember to do it with Magic because they're not immune to this particular type of combat. Use rocks, giant eggs and columns to make Dragon stuck and end them by casting your spells.