advice needed

Hi,
I'm new to keeping chickens. We had thought about it previously, but never got round to it.  But at the end of last year agreed to take on the results of hatching
a couple of friends eggs and have ended up with a cockerel, and hen, now 18 weeks.
they are lovely, very tame, and the kids adore them.
My question: seeing that we've only one that will lay for us, and that won't supply enough
eggs for a family of 6, what would be the best way to increase our stock? should we get
chicks that are sexed, or go for POL? we would only think of getting another 2 or possibly 3, and cant run the risk of any more males, (have been offered some more hatchlings from the same source, but don't feel we should have them as you can't sex them until they lay/crow) Also would like to avoid any problems introducing them, and would like them tame enough for the children to handle. Can you recommend any particular breeds

Advice welcomed

Thanks

I would definatly get point of lay. I have Cuckoo marans and they are lovely very frendly but you have to go slowly at first as they can be a bit nervous. They also so lay beautiful eggs every day.