Welcome!
As others have said, take it steady, don't try to get everything going at once. And 7 acres sounds loads, but it really isn't. As Rosemary says, allow one to two acres per bovine and per equine - and don't forget to account for grazing for the geese too
I don't know about growing birds, but farmers hereabouts reckon 3-5 adult geese need the same amount of grass as a cow!
Milking cattle is wonderful - but creates a lot of work and a daily chore. You can make it easier on yourself by keeping the calf on its mum and only removing the calf overnight when you want to milk in the morning, otherwise leaving the calf with mum. And as Rosemary says, it's not kind to have a single cow, even if she has her calf with her (plus you'll need to take calfie off overnight to get some milk for yourself after the first month or so), so you need two cows-and-calves, really.
Breeding pigs is a delight - but everyone will tell you that you need to keep a sow breeding, and they're right. So that means two litters per year per sow - and again, no solo herd animals, so at least two sows. Unless you have built up a good customer base for weaners and/or meat, you will very quickly be overrun with porkers, freezers full of pork, etc. So good idea to start with buying a couple in
- and don't be in a rush to start breeding. Much better to keep buying in weaners and build up your client base until you are sure you have a market for 30-plus porkers per year. Not to mention that I and others have found that pigs outdoors over winter isn't necessarily kindest to the pigs, even the hardy rare breed types, so then you need good winter housing for the sows and half of those growers too.
Ponies are lovely to have about and will love to do some work - but tbh there really isn't a lot they can do on 7 acres which is mainly grazing. So have some and enjoy them by all means - but accept that they are predominantly pets and riding/driving ponies! Two cobs may use up about half your land, depending on the grass. (And again, no solo herd animals.)
Ponies and cattle both may need wintering in, even if they are hardy, in order to protect the ground. So again, you may need to think about winter housing. Also of course forage storage. Silage needs eating up within 4 days, ideally less, so really you need 10 or more cattle-plus-ponies to eat a large bale of silage before it goes off. So you'll mostly be using hay and straw for winter feed, which needs to be stored under cover.
And all those wintering animals..? Means a
lot of work. You don't mention whether you are going to be full-time smallholders or would have a 'day job' - but build up slowly until you have experienced the winter workload.
All of which said, now is a real fun time, looking at options, researching, choosing breeds/types. You'll find proponents of every breed and type there is, all telling you why their breed is best - so one piece of advice is go to shows and visit breeders whenever you can, and see which animals you like the look of. You'll be getting up and going out in dreadful conditions to care for them, so start with ones you really like!