Read this whole thing before starting, there's some stuff I only tell you about halfway through which you need to know to start properly.
So, with Forge, you have items, blocks, and now fluids. These fluids can be stored in any block a mod author registers as a tank, including various machines that use or create said fluids. They can be pulled out with any kind of fluid pipe, which, for you, probably includes EnderIO conduits, Buildcraft fluid pipes, and Thermal Expansion (Thermal Dynamics) Fluiducts. These all have their own methods of working; I'll explain Buildcraft, as that is the simplest (though the others are more useful if you look into them). For buildcraft, you'll want to start with some basic pipes. There are various tiers, some of which have special uses - the "regular" ones which you'll want to use for simplicity's sake (although they all have tooltips which you can use to get info) are, in order of throughput, Cobblestone, Stone, and Quartz (note that these cannot connect to each other, which is useful as you continue automating things). You'll also need a wooden fluid pipe to extract fluids FROM the Mass Fab (probably; this may be different depending on how the mass fab itself works, someone with more IC2 experience can explain that). So, you place down your Wooden Fluid pipe next to the Mass Fab, and then you need to power it. This can be done with RF (a different electricity system from IC2), or you can use Buildcraft's native engines (which I recommend). In particular, the Redstone Engine is cheap, simple, and doesn't require anything but redstone signal to run. So craft a Redstone Engine (or more, which will be faster) and place it/them down next to the wooden pipe and power them all with redstone signal. They should begin a pumping animation. Now, the wooden fluid pipe will pull the liquid out of the Mass Fab, and place it into the next available fluid inventory - this can be a machine using UU, a tank, or pipes. In the event that wherever you want the UU to go is not directly adjacent to the wooden pipe, you will need to make a line of Cobblestone, Stone, or Quartz fluid pipes connecting the wooden pipe to the final destination. Now, the fluid will flow through the pipes to your final machine. BAM! That's automation!
