You must use the left side of the worlds dungeon walls. The brick walls crafted through the station do not help with creating a dungeon, and are rather just for decorative purposes. Place them underground in the mass of dungeon walls to the far left side of the world to get a dungeon. To use it, bring an iron/lead bar to it, and craft dungeon bricks. Take a honey bucket to the guide to see how. Just check his shop about the time you would normally fight the boss you want to fight, and it is likely you will see the summoning item in his shop. To see their crafting recipe, it may be best to get a recipe browser, or give to the guide an item you think is related to one of the previously mentioned items. You can craft demon altars/shadow orbs/hellforges/pots/lihzahrd power cells/lihzahrd altars/chlorophyte, and some others. Certain projectiles are able to harvest from the stone Hermes boots, star fury, staff of regrowth, water walking boots, etc. Remember, crates help get lots of items. After beating skeletron, the merchant sells an item to send your world to hardmode Hitting stone gives you a bunch of items If you want to download the skyblock world file, instructions are in the homepage (Discord) if you go the the channel called 'Skyblock world download' This mod allows you to play skyblock in Terraria easily. Subscribe to Dacern the creator on YouTube

Terraria skyblock map download