When it comes to thaumcraft, charging your wand can be a pain so I have a few recommendations. First, make the goggles of revealing asap so you can see nodes.
In single player, I've found he easiest way to charge your wands is to just build a semi-vanilla mob farm hanging above a deep ocean with a manual kill option. The mobs drop essence orbs your wand will drink up as long as you have them in your quick-slots.
Alternatively, if you build the mob farm high enough above a thaumcraft magic forest biome, you can get pegs spawning for some of their special loot.
This mob farm is basically a bunch of extra-utilities conveyor blocks as spawning platform cascading into a 1x1 pipe dropping mobs about 26 blocks. I'll be standing in front of the kill chamber, on top of a half-slab and below an upside down half-slab, so I can kit all the mobs grouping up with a specially crafted fortune weapon. while the mobs can's hurt me.
In addition to my wands filling up, I'll also get a good supply of mob drops from it.