Balrog and servants of Sauron

[samrohan]

I have looked through the topics and cannot find any topics based on this precisely. If there is one, please point me in the right direction.

I read in another topic that 'Sauron had no intention to awake the Balrog in the mines of Moria'.

To this quote I have a few comments:

As Sauron seemingly had no power over the Balrog for this creature is too old and too powerful for that, I have wondered why it sides the orcs and trolls and goes after the Nine towards the Bridge.

If I remember rightly, Gandalf says something along the lines of the Drums have awoken the Balrog. If I was awoken by drums and I had the power of the Balrog, I think I would not go after the Nine but crush a bit of Orc as the culprits for weaking me up.

Another idea is as the Balrog is apparently taking the side of the orcs, how do they communicate? Who is in charge in the Mines of Moria, does Sauron have another lieutenant in charge of his troups there?
These orcs and trolls are obviously not without command, but no mention is made of it. They may well have a few sergeant of the type of Shagrat and Gorbag but that would be clearly insufficient to control such a mass of brainless truants...

It also has always puzzled me that so many orcs could be found so far from Mordor as they would have had to cross Rohan and other friendly areas. Little troups could sneak through but surely not large legions which seem to inhabite Moria.

A silly question which comes to my mind is:

How do the orcs in the now deserted Moria survive? They obviously do not trade. Orcs need to eat, how did these cope? SUrely not Lembas...