So the main thing you need to do to form a HQ is to anchor it properly.
I've found it works best to use visualizations to control the process, so we'll take this step by step for those who wants to participate now.
What you need to do is to form a carbon pole, like a nail or spear. Just see yourself form this out of the most basic matter.
Then you find a spot in the universe that only you have access to. A place that's obscure but feels comfy in some way.
You place the carbon pole with the tip on the "ground" in this place and start spinning it, drilling it into the ground. Carbon is just coal, but if placed under pressure it will turn into diamond.
So this is what you need to do. Take this pole of the most base materials and turn it into a diamond pole, which will serve as the foundation of your astral world. Drive it into the ground until you know for a fact that it's turned into diamond.
One is enough, but if you want to expand the place or create more stability, you can create multiple grounding poles in different spots.
So this will be the first task. Create at least one grounding pole for your astral HQ and report back when done.
Ok. Now I want you to start gathering some mud or earth on the foundation. Let it build up to ground level so it becomes a walkable surface. You decided yourself when you placed it if it's in a far off place or if it's connected to something, so if it should have sea around or not is up to you.
When you have a walkable surface (you can also add rocks or volcanic activity or anything that seems to work to create ground)
add things you want to have there like maybe grass, trees etc, and if you want a shelter or a house, add that. Keep it simple at first.
Try projecting there or just meditating on it, viewing it, and report back your experiences and feelings.
Alright. Now for you to get an idea and compare what you created, the next part will be to visit my island.
Instruction as follows:
Look to your left side, and up a bit. Across the sea, there is an island. You're standing on the rocks by the shore, and there's a path ahead. It leads up narrow stairs cut out from the cliff, walking up you will find yourself by an iron gate. Open the gate and step inside. You're now on a trail with hazels on both sides, you notice some wildlife like crows and blackbirds skipping about further inside the woods.
After walking for a bit, you start seeing signs of civilization. Depending on your intents, you will find yourself at any of the following locations:
The mall (open place where most people can visit)
The media center
The village (living place for selected souls)
The mansion (my own place)
The misty plains (inhabited by mist faires and ghosts)
The refugee camp (rehabilitation area for souls transferred from hell)
The path to hell
Walking down the path to hell is fully possible and this will lead to the prison and army headquarters below the island. This place is filled with demons, they won't hurt you if you're a guest, but they're still scary.
Even if you are a guest, you have to behave. Any hostile behaviour will call on the attention of demon mercenaries on guard duty. You won't see them until they appear, they won't show themselves for no reason. Security is very tight.
There is also a tower to heaven and a beach area connecting to the infernal level of the Collective, but both of those are connection points and aren't really a part of the island. If you go to the beach you can find some infernal succubus.