Lovely, I hope they settle in well. How old are they? Any signs of reddening combs? As Chris says pullets usually take a while to get the hang of perching, and you can help them learn by lifting them up on to the perches after dusk, when they've gone to roost. Maybe keep them in the run for a few days to get used to their surroundings before letting them out, as there will be plenty of room for the two of them.
You have however, now got another possible complication to think around. Since these girls will have come from a different place than the other ones you intend to buy, and since they will be well settled in and will feel in charge of the territory by then, you will need to separare any others you get for a couple of weeks quarantine. When chickens move home and have to form part of a new flock, it's always stressful for them, and even if they appear healthy at point of sale the stress often depresses their immune systems so they are more inclined to go down with latent infections they would perhaps otherwise have avoided. Do you know whether these two have been vaccinated? Also, new birds to to a run are always given the runaround by the previous flock as it disturbs the pecking order which has been established in the fist few days and weeks together. This may not be too bad if the pullets are young but you would be best to at least section off part of your run with wire so they can see each other but not fight until they're more used to each other. The ideal way is to get all the new birds from the same place at the same time, so they're all used to each other, have come from the same environment and are all going into a new run together. At least they have lots of space during the day, it will be in the run itself that you I'll have to keep a very careful eye for a while. There may not be any problems, but forewarned is forearmed!
Also, maybe you might like to ask advice from others here who have kept cockerels about what age he should be when you get him. I don't keep cockerels but have read posts suggesting that a young bird may have trouble exerting his authority over hens that don't respect him.
Keeping chickens is really very straightforward, I hope I don't sound like the voice of doom, but its good to avoid problems which might arise.