First off... Hi Diesel! Good thing you're starting to ask...

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what is the best material for a beginner to build houses or walls? I mean which is the easiest to use material?
Check out this
post in the forums on building walls.
An easy way of building walls for me is to get styrofoam board from any local bookstore, mark out the details you want on the wall, scribe out the markings, leaving the details, apply a thin layer of wall putty onto the styrofoam, wait for it to dry and paint.
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what is the best material for building bases?
Using photoframes is one way of making a base. Other materials include wood you get from your craft stores.
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what paints are best to be used for bases and houses?
It depends. Acrylics, Enamels, etc... they all can be used to paint bases and houses. I personally like to use Acrylics (maybe because they're the majority in my stash of paints

)
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what type pf glue do u guys recommend?
If you're refering to gluing wooden houses, wooden fences, etc... then white glue will do fine. Super glue is also useable. If you're planning to glue plastics, then get cement (I use Tamiya's Extra Thin Cement).

Lastly, if you're new to diorama making and you're interested, check out this
diorama feature by Keith Magee (KFMAGEE). It's a great feature to read on.
Sorry for the long reply...
Cheers,