Egghead_Jr is right. There is no guarantee that any of your hens will go broody, so your best option is probably to enquire locally for eggs if that situation occurs. Also shipped eggs are less successful, so that's another reason to find some locally. Broodiness has been bred out of most hens these days as the majority of people want them to produce the maximum number of eggs possible. If you had a silkie or cochin in your flock, then that would greatly increase the likelihood of having a hen go broody.
The other thing to consider is what you plan to do with the cockerels that will almost certainly result from hatching fertile eggs. If you plan to raise them to eat, then you are best looking for hatching eggs from a dual purpose breed. If you are not going to eat them then it's a good idea to have a plan regarding what you are going to do with them before you start.... They grow up remarkably quickly and start to make a nuisance of themselves before you know it, both from a crowing point of view but also harassing your hens. The vast majority of people who find themselves with roosters are looking to rehome them and there isn't a fairytale ending for most of them, much as people like to kid themselves there is.
Since you are looking for good layers I would respectfully suggest that Polish are not the breed for you. I too would highly recommend sex links both for character and egg production. I particularly like black sex links although for some reason I don't seem to have any in my flock at the moment. As regards being noisy, I think it comes down to the individual although I find my welsummers quite quiet in general, but I think that may be more to do with the strain than breed.
The other thing to consider is what you plan to do with the cockerels that will almost certainly result from hatching fertile eggs. If you plan to raise them to eat, then you are best looking for hatching eggs from a dual purpose breed. If you are not going to eat them then it's a good idea to have a plan regarding what you are going to do with them before you start.... They grow up remarkably quickly and start to make a nuisance of themselves before you know it, both from a crowing point of view but also harassing your hens. The vast majority of people who find themselves with roosters are looking to rehome them and there isn't a fairytale ending for most of them, much as people like to kid themselves there is.
Since you are looking for good layers I would respectfully suggest that Polish are not the breed for you. I too would highly recommend sex links both for character and egg production. I particularly like black sex links although for some reason I don't seem to have any in my flock at the moment. As regards being noisy, I think it comes down to the individual although I find my welsummers quite quiet in general, but I think that may be more to do with the strain than breed.