Alternators ain't rocket science, you will have 2 or 3 wires on your landy loom (what engine did it have?).
And the alt will have 3 or 4 maybe connectors, one will be big, and have B+ on it, this is the main charge wire, a heavy wire most likely brown, connect that up, now you need your excitor/charge light wire which will go to D+.
More info and a picture of the back of the alt would be good if you need more help, also don't be tempted to run the engine with the alt spinning and not connected to a battery.