Well, outside should be a dark or light grey, while the inside should be a earth toned colour, like tan. The inside design depends on weather you want it to be a house/office/warehouse/Santa's toilet. If a house, you should have couches, chairs, a TV, a cupboard and other things you find at home. If you want your minifigs to have cover, I suggest a few couches or a big chair. In a office, you would want a few desks, computers, cubicles and plants. Put a few doors to show some office rooms. A warehouse would have lots of wooden boxes, and wooden support stands too. There would be a large amount of space. try placing some machinery here and there, like a forklift. the inside walls would be a light or dark grey.

No prob.

Although I hate mega bloks, if it's for walls and stuff it should look OK.

Alright, so, I have made a basic building (just simple 3 walls atm, will make a 4th.) but Im now wondering what to put in it.

I was thinking some pillars and maybe a bunch of these:

Also I was thinking of buying this: (I wanted to get it anyway, it isnt specifically for this scene)

Is there any other suggestions that I should put in? (I have gone with the warehouse)

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Crates, yes.

Also, I'd just make random trash sit around, just to make it look dirty.

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I'd have the walls be white, but very decorated w/ couches, pictures, and bookcases ect.

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I love doing that.