From my understanding Freedom Rangers are a hybrid of four different breeds. As a result, while you can keep some for breeding purposes, they are "mutts" and won't breed true. There are some on this forum who have tried it and were happy with the first generation they hatched and raised for meat.
I don't know whether you can get them in small batches. Here in the U.S. the minimum order is 25. Perhaps if this is the case where you are, you could split a batch with someone else.
One problem with keeping a breeding pair is that a single hen will not keep a rooster happy. While I don't know this from personal experience, the I believe the rule of thumb is one rooster for every 8-10 hens. Less hens and the rooster doesn't leave the hens alone and they get stressed and sometimes are injured from his attentions. Too many more hens and they don't all get fertilized and the eggs don't hatch.
Oh, one more thing, I don't know if Freedom Ranger hens go broody...many modern chickens have lost that instinct. If this is the case, you'll need either a broody hen or an incubator if you plan on hatching your own chicks.
