the Dragon Aspis. 1º This item helps a lot?
All artefacts are good but if you are only recently new, then the Dragon Aspis is the only one you can craft from here on out. Yes it is good, keep ugrading it to gain more benefits. Try finding people that want/do NORMAL mode, you will get more materials to upgrade it since you are locked to gain materials ONCE A WEEK, the higher the difficulty, the higher the gain.
2 º That's what I'm doing, is there anything else that I was doing to equip myself and get Astral?
Make sure you are full lv95 astral gear. If you are not, go get the gear from the anvil NPC in Astral Academy, higher level of gear gives more VIGOR, that's the most important factor in the game considering outgoing numbers (dmg/heal).
Upgrade them by doing astral, burn keys, rework your materials with tools, then upgrade the GRADE of your gear (colors), THEN transmute them to maximize the power from each equipment, this does reallllly help!
3rd. I do not understand what Hero's Compass is for.
These are keys so to say, to enter a harder difficulty of astral. The loot is the same as on s2/s3 but with an addition of insignia's to improve quality of your armor pieces beyond 100% and gain an extra currency when completing an allod to spend on the heroic NPC located next to the AH npc.
4th Another item that I do not understand what it is for is Wand of the Creator.
Wand of the creator is used to convert items for the quest "Path to greatness".
As you have mentioned that you farmed bg's for gaining greatness, as far as my knowledge goes, is not the most efficient way.
What is tho, is farming astral without burning keys (either having none or apply HH(Helping hand)), farm matter, rework the matter to emblems of greatness with the wand of creation. That way is faster than farming bg's. But either way you got there and perhaps you can apply this method to your reincs. Also converting amalgam from the questline you had done speeds it up a ton!
If you have any more questions, feel free to ask!