Well, the ECU loom is self explanitary, just fit all the plugs on the engine, and then the loom has a couple of connectors which plug onto the ECU itself. Put it in the cabin somewhere.
If you mean what nova wires do you need. All you need to do is make sure the ECU has an earth connection (will be in the ECU loom somewhere) and a battery feed, which will also be in the ECU loom somewhere. Then connect a switched live from the ign switch of the nova loom a switched live wire in the 16V's loom. Both are black. Look at the haynes wiring diagrams to find them. If your nova had a coil, you'll find a switched live cable goes to that connector.
Thats enough to start the engine.
Nova dials need Green cable nova to green cable 16V loom for rev counter. Blue/White and Blue/green and Blue in nova loom to the same in the corsa loom for Oil Pressure, Alternator charging light, and water temp.