Frangipani is a 'common name' for Plumeria (was the person who gave you the cuttings an Australian by any chance?).
Cuttings are a really good way to get some of the more spectacular colour variants. There are heaps of specialist plumeria nurseries on the web.
For establishing cuttings I find that regular potting mix can hold too much water with resultant root rot. When I'm striking cuttings of Plumeria I use a 50/50 mix of washed sand with regular potting mix. I've never tried from seed.
and it was a South African who introduced them to the Aussies
They are easy to grow in pots. My issue was that in this cold climate I had to indoors them in Winter - and they got too big.......its not a plant for a pot, unless there is a bonsai version !