With two lovely little girls aged 2.5, I would wait on the rooster. First, roosters have ruined the whole chicken experience for a lot of kids. Roosters tend to attack children first. And people without much chicken experience often fail to pick up on the cues that the roosters are becoming aggressive. The darling becomes the nightmare in an instant.
This board is full of posts like that.
A lot depends on your set up, if you have a farm set up, where the chickens are out back with the barn, maybe, but if your family is sharing the backyard with the chickens, it is another deal.
And, if I read your post correctly, you are just getting a flock of chicks. (the way most of us start) The rooster chicks grow much faster than the pullet chicks, they become interested in sex, much sooner than the pullets. They become the bully, as there are no bigger birds to thump some manners into them. I have a theory that you get better roosters in multi-generational flocks.
This is a fun hobby you can enjoy for years to come, and share that with your girls. One does not have to do every aspect this year, work into it. Just have hens this year, pray for a broody hen next year, and put either someone else's fertilized eggs under her or day old chicks, let her and this years flock raise them up in a proper chicken society. That will give you time to gain some experience, and your girls are going to be that much older.
If you keep a rooster, you have to commit to a sharp knife. Sometimes you will have to immediately intervene, and separate roosters, sometimes you have to cull them from your flock. You need to make the decision before you get there.
MRs K