Wow, that's a big decision!
I can speak as one who's just been accepted for ordiantion training, and has been doing church work for the last year. My observations include;
It can actually be a really positive thing for children. Mine have grown up in church (dd came back to the vicarage we were house-sitting for when she was born and that set the tone). They are very flexible, very used to being part of a wider community, god at relating to adults who are not their relatives and to children of different ages and abilities to themselves, use to standing up at the front and showing what they've made in Sunday school etc. So socailly and in terms of confidence-building they have got a lot out of our church involvement.
For my dh, there is a cost - of me being out in the evenings, of Sundays being very busy, of phone calls about ministry issues. I think though tbh there are fewer expectations on him as a 'ministry husband' than there are on a potential vicar's wife. When I start trainng, he will carry on in his job nad no-one would expect him to give up and run the toddlers' group in the same way that they might for a woman.
The way we've handled this year has been negotiation and communication all the wa, and also a fairly robust safeguarding of our own time as a family so that we get what we need. Tbh we've started being more intentional about spending or time together well as a family, so we've actually had more quality time even though I've been out more (iyswim). For me, I've had a limit of how many evenings I will make myself availble per week, and if I'm asked to do more than that, I simply say no. Because ultimately, I need my family and they need me too.
Does that help at all?