Well done Cal and Mrs Cal, that's great news.
As for top tips....
Go round your house and take loads of pics as it'll never look the same way again. Ever.
Phone someone, anyone, and enjoy the fact that you can actually hear what the other person is saying instead of a little person climbing all over you saying "DAD, DAD, DAD, DAD, DAD, DAD, DAD".
Put on a pair of shoes safe in the knowledge there isn't a surpise in it, jam sandwich anyone?
Watch a WHOLE tv programme.
Rejoice in that fact you can't name all of the backyardigans or know all the words to the fifi and the flowertots song. (It's quite catchy actually)
Above all, resign your self to the fact that you've went right down the pecking order in your own home and have effectively become your wifes/childs b!tch.
I could go on but don't want to spoil all the surprises.