The longer of the two threaded connectors on the solenoid is the positive.
On the silver cap at the back of the starter is the negative.
Ignore the two male connectors which are together for now; but you will need them for powering your ignition and for charging from the alternator. You will need these when you refit the starter to the Landy.
One of the two other male connectors is to energize your solenoid, it might be marked IGN, but if not short each one seperately with your positive supply to the threaded terminal and hope it works.