Every school publishes the admissions policy on their website but for England they should all be the same (except for religious schools).
The only thing that all schools are required to be the same as each other on is that Looked After / Previously Looked after applicants have to be given first priority. After that, there is quite a lot of freedom with regard to actual ranked criteria- very few if any, I suspect go just
- LAC / PLAC
2.Distance,
but some do only have e.g 'Siblings' between those.
Some have a defined catchment area, but this is only a ranking criterion- you cannot be guaranteed a place just because you live in catchment.
RC school's are allowed to prioritise RC applicants over even LAC non-RC.
(Pupils with an Education, Health and Care Plan - EHCP - which names the school are admitted through a parallel system and will be admitted even if the year group is full).
So you absolutely have to look at each school's oversubscription criteria and for your nursery age DC at least, applying in the main admissions round, name as one of your preferences the school that you are most certain to get according to its ranked criteria. The admissions will cut off for a school at the point where the year group is filled, so e.g. if the admission number is 30 for my 'simple' school and the ranked applications go 2 LAC, 20 siblings of pupils already at the school, and 15 more (no sib, so just ranked on distance) the cut-off will fall after the 8th non-sibling and the rest allocated elsewhere.
For mid-year admissions, a set year group maximum will still apply, so it will be a question of where a place is available.
You can apply to any school, not just in Suffolk, so if you choose somewhere on the Norfolk or Essex border, for example, and there is a school in the other county which is suitable, you can apply.
As for suggestions as to where, exactly, in Suffolk, I'm afraid the only bits I know are the places through which my ageing sat nav sends me between home near the outer end of the Thames estuary and wherever in Norwich DS2 happens to be living. I would observe, however, that at least on that route, once off the A12, the county seems to have an obsession with 'open road' not being synonymous with 'national speed limit'. I'm sure I shouldn't really moan about that, though.