Re breed - any that you like. (And you will get many different answers on that) I have GG's (I fell for those the first time I saw them!), and BT's (initially ONLY to bump up the milk suply, but now getting hooked on pedigree breeding those as well).
Depends on how much milk you think you need, if you are planning to breed to pedigree standard, and then what billies are available locally. If you check the BGS website (allgoats.org.uk) there is a show calendar on for 2011, and then you could ring the stewart for more info. If the shows are not part of a large agricultural show, you will also be able to see some males.
Books: My favourite intro book is "The new Goat handbook", by Ulrich Jaudas, out of print, but still sometimes available through abebooks.co.uk, the standard text is "Goat husbandry" by David Mackenzie (5th edition), again abebooks will have it somewhere (This is the most recent edition and I think most up to date, but it's still 1993!), but there are a few newer slim ones that are worth a look into. Check out the library, even some of the 1980s books are good, if you disregard anything to do with regulations.
Go and see a local goatkeeper!
But make sure you have all the fencing, housing, hay supply in place before you get any home.
Have fun!