The first step in getting the Creative Items is to make Aeon Steel. For the recipe, I will once again refer to the Thaumonomicon, this time in the Maleficia tab.
When you have this, you will need to make an Infinity Catalyst. This requires all possible Thaumcraft aspects, and completion of ChromatiCraft.
Once you have this, you can start making the Creative Items.

The first one I would recommend making is the Everlasting Guilty Pool. This will allow you to get the 10 mana pools of mana required for every Infinity Ingot way more easily.
The other items are up to you, but here is a list of them in case you are curious:
 -The Creative Node, infinite Vis.
 -Crystal Studded Cosmic Neutronium Wand, infinite Vis, but in a Wand.
 -Orb Of Testing, infinite LP.
 -Infinity Jar, infinite Thaumcraft aspects.