Hi kerri
Yes, you can visit the beagle for sure - as long as he's up to date with jabs and as long as they play in someone's garden and not out in a public place.
Just be careful that the play stays equal - one should chase the other, then the other should chase back again. Don't let the pup pester the beagle if he doesn't want to play - that might result in the beagle snapping at the pup and that wouldn't be a good socialisation experience. Keep the play session short to prevent it getting too rough - if you pick the pup up every few minutes and hold her to interrupt the play that should help prevent it getting too hyped up. (Sometimes when play gets too rough it suddenly tips over into fighting and you don't want that to happen, so best to interrupt rough play - besides which you don't want your pup to learn to play like that because not all dogs will like it.)
As for classes - I don't think the vets are the best place to find out about them - my own vet's, although an excellent practice, recommend a terrible trainer who uses horrible methods - I can't imagine why. I've spoken to them and told them about this trainer too.
Anyway I would recommend you look at: www.puppyschool.co.uk and see if there's a trainer from there in your area.
Otherwise I would suggest you have a look here:
http://www.apdt.co.uk/trainers_area.asp?area=HampshireI would strongly advise you to go and watch as many classes as you can, before you get your puppy. This is for several reasons - firstly you can only choose the best class in your area if you've watched them all. Secondly, new puppy owners often have nothing to relate their puppy class to and so can't judge it. If you have seen several, you will know if yours is a good one. Third, it is free to watch puppy classes and you will learn lots by doing so. When you get your puppy and before she has had her jabs, you can be teaching her all these things at home, as you've watched in the puppy class. And lastly, it's much easier to learn when you don't have a wriggling bundle of puppy at your feet, so you will actually find it easier to concentrate if you go and watch classes now, before you get her.
Almost all good trainers will allow people to watch their classes - just say that you're getting a puppy soon and is it ok to watch a class. It's actually good fun watching too.