jb101
From the manual:
 
TH2 SONAR by Overloud provides realistic guitar amp models from clean to crushing distortion.
This special edition includes 10 amplifier models, 10 cabinet models, 3 microphone models, and dozens of presets. Easily build or modify your own signal path."

 
I don't think I have anywhere near this amount of amp models (there are only two), cabs (1 cab) and mics (don't even see any mics, just the two hanging over the cabinet) - is there anyway I can check to see if they have been installed properly?

Double click on the cab (in the bottom view) and it will open several "boxes" where you can choose your three mikes, mic distance etc.
 
HTH.

All of the amps, cab and mics are in drop downs inside the amp and cab objects. Notice the two drop downs under the A and B. This allows a choice of amp models with a slider between them to mix the two amps.

 
Open the cabinet up to choose the different speaker and mic settings
 

There is quite a bit of horsepower in this stripped down version. I think you'll get the hang of it. BTW, you can also adjust the mics by left clicking and hold on the mic you want to move and just move the mouse. Release the button when it's in place. This is very handy as you can hear the timbre change as you move the mics around.