In reply to PaulTanton:
M10 size T nuts are the standard I think (off the top of my mildly drunk head.)
A diamond grid of T nuts is pretty much the way to go, makes changing loads a damn site less hassle, fixing the T nuts with a retainer screw to avoid rotation is a good idea too.
2 meters isn't much room, so I'd stick a roof panel up too, but along with angle depends on the depth of the room really. 30-35 degrees and above is considered better, but then that also depends on your current grades, to steep and it'll just be bloody hard, and you'll have to buy lots of (expensive) juggy holds to much use.
Lot to consider!