I'm not sure either on the specific greens but I agree with alan on not being too particular about the first few roasts - make sure you go through the different variables and don't be afraid to junk the first half to a full kilo or so in order to get accustomed to not only the roast process but your machine's behaviour.
Do not start on expensive or blended stuff right away, just make sure it's from a decent supplier and a normal origin, say kenyan or columbian - it took me quite a few before I started getting things tasting decent, and for the love of god and all that is holy make sure the coffee is 'rested' for a day or so.
You can emulate this by grinding and then leaving it in a bowl for about 7 minutes so it'll rest extra quickly as it has increased surface area, but I'd say some people would object thoroughly with that. It'll develop its tastes after the aforementioned resting and the CO2 bloom won't be as bad as with 'just roasted coffee. The first 24 hours are the worst