Also it's good to get them all at the same time from the same place if you want to minimise aggression to the later arrivals. Chickens immediately set to and establish a pecking order, and after even so little as a day or two, newcomers will be met with suspicion or worse.
The other important thing to know is that if you do introduce birds from more than one location, the batches should be kept quarantined from each other for a couple of weeks. This would mean dividing the run with mesh and providing temporary sleeping accommodation for the later arrivals, or providing a second setup. You'll need to be able to do this anyway, whenever in the future you get replacements or additions to your flock, or if/when you have a sick or injured chicken. Moving home is always stressful for chickens and this frequently depresses their immune system so they go down with latent illnesses, even though they appeared perfectly healthy at the breeder's. Or, of course, if not vaccinated, they may introduce some virus or other to the others. So, when starting out, get them all together from the same place if you can, it's just simpler.