They should be very easy to root. Just avoid touching the sap when you take the cuttings. Wait a few days afterwards (or not, as you like) and then pot up in fast draining soil (like 50% pumice/perlite/whatever). Wait a week to water. Then water when dry or nearly dry. You will get the most compact growth and long-term stability with strong light indoors, like hours of daily sun.
I don't think you're going to get great results starting with ultra long stems, just as a matter of stability. My own preference would be to start small with the cuttings, then let them grow to size in their new container. You can definitely root a long cutting, that is not an issue.
